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640222 = 21129101
BaseRepresentation
bin10011100010011011110
31012112012221
42130103132
5130441342
621415554
75304352
oct2342336
91175187
10640222
113a8010
1226a5ba
1319553b
14129462
15c9a67
hex9c4de

640222 has 8 divisors (see below), whose sum is σ = 1047672. Its totient is φ = 291000.

The previous prime is 640219. The next prime is 640223. The reversal of 640222 is 222046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 640196 and 640205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640223) 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, 14529 + ... + 14572.

It is an arithmetic number, because the mean of its divisors is an integer number (130959).

2640222 is an apocalyptic number.

640222 is a deficient number, since it is larger than the sum of its proper divisors (407450).

640222 is a wasteful number, since it uses less digits than its factorization.

640222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29114.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 640222 is about 800.1387379699. The cubic root of 640222 is about 86.1873507098.

Adding to 640222 its reverse (222046), we get a palindrome (862268).

The spelling of 640222 in words is "six hundred forty thousand, two hundred twenty-two".

Divisors: 1 2 11 22 29101 58202 320111 640222