139931648 has 52 divisors (see below), whose sum is σ = 283080960. Its totient is φ = 69156864.

The previous prime is 139931633. The next prime is 139931677. The reversal of 139931648 is 846139931.

It is a super-2 number, since 2×139931648² = 39161732223991808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139931599 and 139931608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520058 + ... + 520326.

Almost surely, 2^139931648 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 139931648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141540480).

139931648 is an abundant number, since it is smaller than the sum of its proper divisors (143149312).

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

139931648 is an equidigital number, since it uses as much as digits as its factorization.

139931648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 398 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 139931648 is about 11829.2708143824. The cubic root of 139931648 is about 519.1648922964.

The spelling of 139931648 in words is "one hundred thirty-nine million, nine hundred thirty-one thousand, six hundred forty-eight".