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639229 = 1016329
BaseRepresentation
bin10011100000011111101
31012110212011
42130003331
5130423404
621411221
75301433
oct2340375
91173764
10639229
113a7298
12269b11
13194c56
14128d53
15c9604
hex9c0fd

639229 has 4 divisors (see below), whose sum is σ = 645660. Its totient is φ = 632800.

The previous prime is 639211. The next prime is 639253. The reversal of 639229 is 922936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 76729 = 750^2 + 277^2 .

It is a cyclic number.

It is not a de Polignac number, because 639229 - 29 = 638717 is a prime.

It is a super-2 number, since 2×6392292 = 817227428882, which contains 22 as substring.

It is a d-powerful number, because it can be written as 65 + 3 + 213 + 95 + 215 + 96 .

It is a Duffinian number.

639229 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 639229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3064 + ... + 3265.

It is an arithmetic number, because the mean of its divisors is an integer number (161415).

2639229 is an apocalyptic number.

It is an amenable number.

639229 is a deficient number, since it is larger than the sum of its proper divisors (6431).

639229 is a wasteful number, since it uses less digits than its factorization.

639229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430.

The product of its digits is 5832, while the sum is 31.

The square root of 639229 is about 799.5179797853. The cubic root of 639229 is about 86.1427680884.

It can be divided in two parts, 639 and 229, that added together give a palindrome (868).

The spelling of 639229 in words is "six hundred thirty-nine thousand, two hundred twenty-nine".

Divisors: 1 101 6329 639229