3656440431 has 48 divisors (see below), whose sum is σ = 6134768640. Its totient is φ = 2055352320.

The previous prime is 3656440423. The next prime is 3656440441. The reversal of 3656440431 is 1340446563.

3656440431 is a `hidden beast` number, since 3 + 6 + 5 + 644 + 0 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 3656440431 - 2³ = 3656440423 is a prime.

It is a super-2 number, since 2×3656440431² = 26739113250902931522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656440441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3439206 + ... + 3440268.

It is an arithmetic number, because the mean of its divisors is an integer number (127807680).

Almost surely, 2^3656440431 is an apocalyptic number.

3656440431 is a deficient number, since it is larger than the sum of its proper divisors (2478328209).

3656440431 is a wasteful number, since it uses less digits than its factorization.

3656440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 3656440431 is about 60468.5077623055. The cubic root of 3656440431 is about 1540.5867824912.

Adding to 3656440431 its reverse (1340446563), we get a palindrome (4996886994).

The spelling of 3656440431 in words is "three billion, six hundred fifty-six million, four hundred forty thousand, four hundred thirty-one".