138948864 has 72 divisors (see below), whose sum is σ = 371844480. Its totient is φ = 46061568.

The previous prime is 138948833. The next prime is 138948883. The reversal of 138948864 is 468849831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183174 + ... + 183930.

Almost surely, 2^138948864 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 138948864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185922240).

138948864 is an abundant number, since it is smaller than the sum of its proper divisors (232895616).

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

138948864 is an equidigital number, since it uses as much as digits as its factorization.

138948864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1001 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 51.

The square root of 138948864 is about 11787.6572736062. The cubic root of 138948864 is about 517.9466162444.

The spelling of 138948864 in words is "one hundred thirty-eight million, nine hundred forty-eight thousand, eight hundred sixty-four".