139608864 has 72 divisors (see below), whose sum is σ = 398558160. Its totient is φ = 46355328.

The previous prime is 139608863. The next prime is 139608869. The reversal of 139608864 is 468806931.

139608864 is a `hidden beast` number, since 1 + 39 + 608 + 8 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (139608863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87627 + ... + 89205.

It is an arithmetic number, because the mean of its divisors is an integer number (5535530).

Almost surely, 2^139608864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139608864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199279080).

139608864 is an abundant number, since it is smaller than the sum of its proper divisors (258949296).

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

139608864 is a wasteful number, since it uses less digits than its factorization.

139608864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 139608864 is about 11815.6194928577. The cubic root of 139608864 is about 518.7653945400.

The spelling of 139608864 in words is "one hundred thirty-nine million, six hundred eight thousand, eight hundred sixty-four".