3638978 has 16 divisors (see below), whose sum is σ = 6454080. Its totient is φ = 1505616.

The previous prime is 3638959. The next prime is 3638993. The reversal of 3638978 is 8798363.

3638978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4076 + ... + 4887.

It is an arithmetic number, because the mean of its divisors is an integer number (403380).

Almost surely, 2^3638978 is an apocalyptic number.

3638978 is a deficient number, since it is larger than the sum of its proper divisors (2815102).

3638978 is a wasteful number, since it uses less digits than its factorization.

3638978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001.

The product of its digits is 217728, while the sum is 44.

The square root of 3638978 is about 1907.6105472554. The cubic root of 3638978 is about 153.8130356020.

The spelling of 3638978 in words is "three million, six hundred thirty-eight thousand, nine hundred seventy-eight".