3656989 has 16 divisors (see below), whose sum is σ = 4492800. Its totient is φ = 2905344.

The previous prime is 3656981. The next prime is 3656993. The reversal of 3656989 is 9896563.

It is a cyclic number.

It is not a de Polignac number, because 3656989 - 2³ = 3656981 is a prime.

It is a super-2 number, since 2×3656989² = 26747137092242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9207 + ... + 9595.

It is an arithmetic number, because the mean of its divisors is an integer number (280800).

Almost surely, 2^3656989 is an apocalyptic number.

It is an amenable number.

3656989 is a deficient number, since it is larger than the sum of its proper divisors (835811).

3656989 is a wasteful number, since it uses less digits than its factorization.

3656989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its digits is 349920, while the sum is 46.

The square root of 3656989 is about 1912.3255475990. The cubic root of 3656989 is about 154.0663822435.

The spelling of 3656989 in words is "three million, six hundred fifty-six thousand, nine hundred eighty-nine".