139192640 has 28 divisors (see below), whose sum is σ = 331453236. Its totient is φ = 55676928.

The previous prime is 139192639. The next prime is 139192649. The reversal of 139192640 is 46291931.

It can be written as a sum of positive squares in 2 ways, for example, as 54405376 + 84787264 = 7376^2 + 9208^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139192640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139192649) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 217169 + ... + 217808.

Almost surely, 2^139192640 is an apocalyptic number.

139192640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139192640 is an abundant number, since it is smaller than the sum of its proper divisors (192260596).

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

139192640 is an equidigital number, since it uses as much as digits as its factorization.

139192640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434994 (or 434984 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 139192640 is about 11797.9930496674. The cubic root of 139192640 is about 518.2493395695.

The spelling of 139192640 in words is "one hundred thirty-nine million, one hundred ninety-two thousand, six hundred forty".