139901868 has 36 divisors (see below), whose sum is σ = 354637920. Its totient is φ = 46502496.

The previous prime is 139901851. The next prime is 139901869. The reversal of 139901868 is 868109931.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (139901869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7918 + ... + 18506.

Almost surely, 2^139901868 is an apocalyptic number.

139901868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139901868 is an abundant number, since it is smaller than the sum of its proper divisors (214736052).

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

139901868 is a wasteful number, since it uses less digits than its factorization.

139901868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10966 (or 10961 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 139901868 is about 11828.0120054048. The cubic root of 139901868 is about 519.1280604392.

The spelling of 139901868 in words is "one hundred thirty-nine million, nine hundred one thousand, eight hundred sixty-eight".