139149978 has 32 divisors (see below), whose sum is σ = 310666752. Its totient is φ = 41185200.

The previous prime is 139149971. The next prime is 139149991. The reversal of 139149978 is 879941931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 139149978.

It is not an unprimeable number, because it can be changed into a prime (139149971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21678 + ... + 27353.

It is an arithmetic number, because the mean of its divisors is an integer number (9708336).

Almost surely, 2^139149978 is an apocalyptic number.

139149978 is an abundant number, since it is smaller than the sum of its proper divisors (171516774).

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

139149978 is a wasteful number, since it uses less digits than its factorization.

139149978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49090.

The product of its digits is 489888, while the sum is 51.

The square root of 139149978 is about 11796.1848917351. The cubic root of 139149978 is about 518.1963870271.

The spelling of 139149978 in words is "one hundred thirty-nine million, one hundred forty-nine thousand, nine hundred seventy-eight".