3640997 has 4 divisors (see below), whose sum is σ = 3646080. Its totient is φ = 3635916.

The previous prime is 3640993. The next prime is 3640999. The reversal of 3640997 is 7990463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3640997 - 2² = 3640993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3640997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1247 + ... + 2972.

It is an arithmetic number, because the mean of its divisors is an integer number (911520).

Almost surely, 2^3640997 is an apocalyptic number.

It is an amenable number.

3640997 is a deficient number, since it is larger than the sum of its proper divisors (5083).

3640997 is an equidigital number, since it uses as much as digits as its factorization.

3640997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5082.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 3640997 is about 1908.1396699403. The cubic root of 3640997 is about 153.8414768386.

The spelling of 3640997 in words is "three million, six hundred forty thousand, nine hundred ninety-seven".