139508640 has 144 divisors (see below), whose sum is σ = 501228000. Its totient is φ = 35237376.

The previous prime is 139508623. The next prime is 139508651. The reversal of 139508640 is 46805931.

139508640 is a `hidden beast` number, since 1 + 3 + 9 + 5 + 0 + 8 + 640 = 666.

139508640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 139508595 and 139508604.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 24811 + ... + 29909.

It is an arithmetic number, because the mean of its divisors is an integer number (3480750).

Almost surely, 2^139508640 is an apocalyptic number.

139508640 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 139508640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250614000).

139508640 is an abundant number, since it is smaller than the sum of its proper divisors (361719360).

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

139508640 is a wasteful number, since it uses less digits than its factorization.

139508640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139 (or 5128 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 139508640 is about 11811.3775657203. The cubic root of 139508640 is about 518.6412257537.

The spelling of 139508640 in words is "one hundred thirty-nine million, five hundred eight thousand, six hundred forty".