3655978 has 8 divisors (see below), whose sum is σ = 5523840. Its totient is φ = 1814700.

The previous prime is 3655957. The next prime is 3655987. The reversal of 3655978 is 8795563.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6298 + ... + 6853.

It is an arithmetic number, because the mean of its divisors is an integer number (690480).

Almost surely, 2^3655978 is an apocalyptic number.

3655978 is a deficient number, since it is larger than the sum of its proper divisors (1867862).

3655978 is a wasteful number, since it uses less digits than its factorization.

3655978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13292.

The product of its digits is 226800, while the sum is 43.

The square root of 3655978 is about 1912.0611914894. The cubic root of 3655978 is about 154.0521833612.

The spelling of 3655978 in words is "three million, six hundred fifty-five thousand, nine hundred seventy-eight".