3656739 has 4 divisors (see below), whose sum is σ = 4875656. Its totient is φ = 2437824.

The previous prime is 3656707. The next prime is 3656753. The reversal of 3656739 is 9376563.

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

It is not a de Polignac number, because 3656739 - 2⁵ = 3656707 is a prime.

It is a super-2 number, since 2×3656739² = 26743480228242, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3656697 and 3656706.

It is not an unprimeable number, because it can be changed into a prime (3656039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609454 + ... + 609459.

It is an arithmetic number, because the mean of its divisors is an integer number (1218914).

Almost surely, 2^3656739 is an apocalyptic number.

3656739 is a deficient number, since it is larger than the sum of its proper divisors (1218917).

3656739 is a wasteful number, since it uses less digits than its factorization.

3656739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218916.

The product of its digits is 102060, while the sum is 39.

The square root of 3656739 is about 1912.2601810423. The cubic root of 3656739 is about 154.0628713886.

The spelling of 3656739 in words is "three million, six hundred fifty-six thousand, seven hundred thirty-nine".