138472752 has 80 divisors (see below), whose sum is σ = 413223552. Its totient is φ = 39490560.

The previous prime is 138472739. The next prime is 138472787. The reversal of 138472752 is 257274831.

It is a self number, because there is not a number n which added to its sum of digits gives 138472752.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1263 + ... + 16689.

Almost surely, 2^138472752 is an apocalyptic number.

138472752 is a gapful number since it is divisible by the number (12) 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 138472752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206611776).

138472752 is an abundant number, since it is smaller than the sum of its proper divisors (274750800).

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

138472752 is a wasteful number, since it uses less digits than its factorization.

138472752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15466 (or 15460 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 138472752 is about 11767.4445824062. Note that the first 3 decimals coincide. The cubic root of 138472752 is about 517.3543532808.

The spelling of 138472752 in words is "one hundred thirty-eight million, four hundred seventy-two thousand, seven hundred fifty-two".