3656440 has 16 divisors (see below), whose sum is σ = 8227080. Its totient is φ = 1462560.

The previous prime is 3656437. The next prime is 3656441. The reversal of 3656440 is 446563.

It is a junction number, because it is equal to n+sod(n) for n = 3656399 and 3656408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656441) 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, 45666 + ... + 45745.

Almost surely, 2^3656440 is an apocalyptic number.

It is an amenable number.

3656440 is an abundant number, since it is smaller than the sum of its proper divisors (4570640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3656440 is a wasteful number, since it uses less digits than its factorization.

3656440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91422 (or 91418 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 3656440 is about 1912.1819997061. The cubic root of 3656440 is about 154.0586721959.

It can be divided in two parts, 3656 and 440, that added together give a 12-th power (4096 = 2¹²).

The spelling of 3656440 in words is "three million, six hundred fifty-six thousand, four hundred forty".