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3138649 = 23136463
BaseRepresentation
bin1011111110010001011001
312220110102021
423332101121
51300414044
6151134441
735451403
oct13762131
95813367
103138649
111854128
121074421
1385b7b7
145b9b73
1541ee84
hex2fe459

3138649 has 4 divisors (see below), whose sum is σ = 3275136. Its totient is φ = 3002164.

The previous prime is 3138647. The next prime is 3138661. The reversal of 3138649 is 9468313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3138649 - 21 = 3138647 is a prime.

It is a super-2 number, since 2×31386492 = 19702235090402, which contains 22 as substring.

It is a Duffinian number.

3138649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3138647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68209 + ... + 68254.

It is an arithmetic number, because the mean of its divisors is an integer number (818784).

Almost surely, 23138649 is an apocalyptic number.

It is an amenable number.

3138649 is a deficient number, since it is larger than the sum of its proper divisors (136487).

3138649 is a wasteful number, since it uses less digits than its factorization.

3138649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136486.

The product of its digits is 15552, while the sum is 34.

The square root of 3138649 is about 1771.6232669504. The cubic root of 3138649 is about 146.4134306659.

The spelling of 3138649 in words is "three million, one hundred thirty-eight thousand, six hundred forty-nine".

Divisors: 1 23 136463 3138649