3640987 has 8 divisors (see below), whose sum is σ = 4188896. Its totient is φ = 3100032.

The previous prime is 3640937. The next prime is 3640991. The reversal of 3640987 is 7890463.

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 3640987 - 2⁷ = 3640859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3640937) 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, 558 + ... + 2755.

It is an arithmetic number, because the mean of its divisors is an integer number (523612).

Almost surely, 2^3640987 is an apocalyptic number.

3640987 is a deficient number, since it is larger than the sum of its proper divisors (547909).

3640987 is a wasteful number, since it uses less digits than its factorization.

3640987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3477.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 3640987 is about 1908.1370495853. The cubic root of 3640987 is about 153.8413359966.

The spelling of 3640987 in words is "three million, six hundred forty thousand, nine hundred eighty-seven".