3656439 has 6 divisors (see below), whose sum is σ = 5281536. Its totient is φ = 2437620.

The previous prime is 3656437. The next prime is 3656441. The reversal of 3656439 is 9346563.

3656439 is a `hidden beast` number, since 3 + 6 + 5 + 643 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (3656437) and next prime (3656441).

It is not a de Polignac number, because 3656439 - 2¹ = 3656437 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 203127 + ... + 203144.

It is an arithmetic number, because the mean of its divisors is an integer number (880256).

Almost surely, 2^3656439 is an apocalyptic number.

3656439 is a deficient number, since it is larger than the sum of its proper divisors (1625097).

3656439 is a wasteful number, since it uses less digits than its factorization.

3656439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406277 (or 406274 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 3656439 is about 1912.1817382247. The cubic root of 3656439 is about 154.0586581514.

It can be divided in two parts, 3656 and 439, that added together give a triangular number (4095 = T₉₀).

The spelling of 3656439 in words is "three million, six hundred fifty-six thousand, four hundred thirty-nine".