139112640 has 168 divisors, whose sum is σ = 496488720. Its totient is φ = 37075968.

The previous prime is 139112629. The next prime is 139112641. The reversal of 139112640 is 46211931.

139112640 is a `hidden beast` number, since 1 + 3 + 9 + 1 + 12 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (139112641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76866 + ... + 78654.

It is an arithmetic number, because the mean of its divisors is an integer number (2955290).

Almost surely, 2^139112640 is an apocalyptic number.

139112640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139112640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248244360).

139112640 is an abundant number, since it is smaller than the sum of its proper divisors (357376080).

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

139112640 is an equidigital number, since it uses as much as digits as its factorization.

139112640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 139112640 is about 11794.6021552234. The cubic root of 139112640 is about 518.1500338097.

The spelling of 139112640 in words is "one hundred thirty-nine million, one hundred twelve thousand, six hundred forty".