139235680 has 24 divisors (see below), whose sum is σ = 328944672. Its totient is φ = 55694208.

The previous prime is 139235669. The next prime is 139235689. The reversal of 139235680 is 86532931.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139235689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434952 + ... + 435271.

It is an arithmetic number, because the mean of its divisors is an integer number (13706028).

Almost surely, 2^139235680 is an apocalyptic number.

139235680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139235680 is an abundant number, since it is smaller than the sum of its proper divisors (189708992).

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

139235680 is an equidigital number, since it uses as much as digits as its factorization.

139235680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870238 (or 870230 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 139235680 is about 11799.8169477327. The cubic root of 139235680 is about 518.3027503268.

The spelling of 139235680 in words is "one hundred thirty-nine million, two hundred thirty-five thousand, six hundred eighty".