3656987 has 8 divisors (see below), whose sum is σ = 3982800. Its totient is φ = 3344544.

The previous prime is 3656981. The next prime is 3656993. The reversal of 3656987 is 7896563.

It is an interprime number because it is at equal distance from previous prime (3656981) and next prime (3656993).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3656987 - 2⁶ = 3656923 is a prime.

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

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 2768 + ... + 3869.

It is an arithmetic number, because the mean of its divisors is an integer number (497850).

Almost surely, 2^3656987 is an apocalyptic number.

3656987 is a deficient number, since it is larger than the sum of its proper divisors (325813).

3656987 is a wasteful number, since it uses less digits than its factorization.

3656987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6685.

The product of its digits is 272160, while the sum is 44.

The square root of 3656987 is about 1912.3250246755. The cubic root of 3656987 is about 154.0663541572.

It can be divided in two parts, 36569 and 87, that multiplied together give a triangular number (3181503 = T₂₅₂₂).

The spelling of 3656987 in words is "three million, six hundred fifty-six thousand, nine hundred eighty-seven".