3640978 has 16 divisors (see below), whose sum is σ = 5987520. Its totient is φ = 1646800.

The previous prime is 3640937. The next prime is 3640991. The reversal of 3640978 is 8790463.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7668 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (374220).

Almost surely, 2^3640978 is an apocalyptic number.

3640978 is a deficient number, since it is larger than the sum of its proper divisors (2346542).

3640978 is a wasteful number, since it uses less digits than its factorization.

3640978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833.

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

The square root of 3640978 is about 1908.1346912626. The cubic root of 3640978 is about 153.8412092385.

It can be divided in two parts, 36 and 40978, that added together give a palindrome (41014).

The spelling of 3640978 in words is "three million, six hundred forty thousand, nine hundred seventy-eight".