3656431 has 4 divisors (see below), whose sum is σ = 3665200. Its totient is φ = 3647664.

The previous prime is 3656413. The next prime is 3656437. The reversal of 3656431 is 1346563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1346563 = 41 ⋅32843.

It is a cyclic number.

It is not a de Polignac number, because 3656431 - 2¹¹ = 3654383 is a prime.

It is a super-2 number, since 2×3656431² = 26738975315522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3656431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656437) 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, 3726 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (916300).

Almost surely, 2^3656431 is an apocalyptic number.

3656431 is a deficient number, since it is larger than the sum of its proper divisors (8769).

3656431 is an equidigital number, since it uses as much as digits as its factorization.

3656431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8768.

The product of its digits is 6480, while the sum is 28.

The square root of 3656431 is about 1912.1796463722. The cubic root of 3656431 is about 154.0585457953.

The spelling of 3656431 in words is "three million, six hundred fifty-six thousand, four hundred thirty-one".