3138978 has 16 divisors (see below), whose sum is σ = 6397056. Its totient is φ = 1026480.

The previous prime is 3138953. The next prime is 3138991. The reversal of 3138978 is 8798313.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4618 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (399816).

Almost surely, 2^3138978 is an apocalyptic number.

3138978 is an abundant number, since it is smaller than the sum of its proper divisors (3258078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3138978 is a wasteful number, since it uses less digits than its factorization.

3138978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9929.

The product of its digits is 36288, while the sum is 39.

The square root of 3138978 is about 1771.7161172152. The cubic root of 3138978 is about 146.4185462783.

The spelling of 3138978 in words is "three million, one hundred thirty-eight thousand, nine hundred seventy-eight".