139898978 has 16 divisors (see below), whose sum is σ = 215184384. Its totient is φ = 68183040.

The previous prime is 139898963. The next prime is 139898989. The reversal of 139898978 is 879898931.

It is a self number, because there is not a number n which added to its sum of digits gives 139898978.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21263 + ... + 27053.

It is an arithmetic number, because the mean of its divisors is an integer number (13449024).

Almost surely, 2^139898978 is an apocalyptic number.

139898978 is a deficient number, since it is larger than the sum of its proper divisors (75285406).

139898978 is a wasteful number, since it uses less digits than its factorization.

139898978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6097.

The product of its digits is 7838208, while the sum is 62.

The square root of 139898978 is about 11827.8898371603. The cubic root of 139898978 is about 519.1244858136.

The spelling of 139898978 in words is "one hundred thirty-nine million, eight hundred ninety-eight thousand, nine hundred seventy-eight".