3990878 has 16 divisors (see below), whose sum is σ = 6289920. Its totient is φ = 1896600.

The previous prime is 3990863. The next prime is 3990901. The reversal of 3990878 is 8780993.

It is a congruent number.

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, 3113 + ... + 4203.

It is an arithmetic number, because the mean of its divisors is an integer number (393120).

Almost surely, 2^3990878 is an apocalyptic number.

3990878 is a deficient number, since it is larger than the sum of its proper divisors (2299042).

3990878 is a wasteful number, since it uses less digits than its factorization.

3990878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 3990878 is about 1997.7181983453. The cubic root of 3990878 is about 158.6193444153.

The spelling of 3990878 in words is "three million, nine hundred ninety thousand, eight hundred seventy-eight".