139806975 has 96 divisors (see below), whose sum is σ = 295409664. Its totient is φ = 56649600.

The previous prime is 139806971. The next prime is 139807021. The reversal of 139806975 is 579608931.

It is a Cunningham number, because it is equal to 11824²-1.

It is not a de Polignac number, because 139806975 - 2² = 139806971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139806971) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 248044 + ... + 248606.

It is an arithmetic number, because the mean of its divisors is an integer number (3077184).

Almost surely, 2^139806975 is an apocalyptic number.

139806975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139806975 is an abundant number, since it is smaller than the sum of its proper divisors (155602689).

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

139806975 is a wasteful number, since it uses less digits than its factorization.

139806975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 139806975 is about 11823.9999577131. Note that the first 4 decimals coincide. The cubic root of 139806975 is about 519.0106620520.

The spelling of 139806975 in words is "one hundred thirty-nine million, eight hundred six thousand, nine hundred seventy-five".