139452978 has 16 divisors (see below), whose sum is σ = 318749760. Its totient is φ = 39843696.

The previous prime is 139452953. The next prime is 139452983. The reversal of 139452978 is 879254931.

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, 1660113 + ... + 1660196.

It is an arithmetic number, because the mean of its divisors is an integer number (19921860).

Almost surely, 2^139452978 is an apocalyptic number.

139452978 is an abundant number, since it is smaller than the sum of its proper divisors (179296782).

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

139452978 is a wasteful number, since it uses less digits than its factorization.

139452978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320321.

The product of its digits is 544320, while the sum is 48.

The square root of 139452978 is about 11809.0210432533. The cubic root of 139452978 is about 518.5722397083.

The spelling of 139452978 in words is "one hundred thirty-nine million, four hundred fifty-two thousand, nine hundred seventy-eight".