3139978 has 12 divisors (see below), whose sum is σ = 4972050. Its totient is φ = 1487016.

The previous prime is 3139967. The next prime is 3139979. The reversal of 3139978 is 8799313.

It can be written as a sum of positive squares in only one way, i.e., 3122289 + 17689 = 1767^2 + 133^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3139978.

It is not an unprimeable number, because it can be changed into a prime (3139979) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1453 + ... + 2896.

Almost surely, 2^3139978 is an apocalyptic number.

3139978 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

3139978 is a deficient number, since it is larger than the sum of its proper divisors (1832072).

3139978 is a wasteful number, since it uses less digits than its factorization.

3139978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389 (or 4370 counting only the distinct ones).

The product of its digits is 40824, while the sum is 40.

The square root of 3139978 is about 1771.9983069969. The cubic root of 3139978 is about 146.4340930583.

The spelling of 3139978 in words is "three million, one hundred thirty-nine thousand, nine hundred seventy-eight".