139804978 has 16 divisors (see below), whose sum is σ = 221082624. Its totient is φ = 66206880.

The previous prime is 139804967. The next prime is 139804979. The reversal of 139804978 is 879408931.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (139804979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21075 + ... + 26902.

It is an arithmetic number, because the mean of its divisors is an integer number (13817664).

Almost surely, 2^139804978 is an apocalyptic number.

139804978 is a deficient number, since it is larger than the sum of its proper divisors (81277646).

139804978 is a wasteful number, since it uses less digits than its factorization.

139804978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48057.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 139804978 is about 11823.9155105236. The cubic root of 139804978 is about 519.0081908610.

The spelling of 139804978 in words is "one hundred thirty-nine million, eight hundred four thousand, nine hundred seventy-eight".