138624470 has 8 divisors (see below), whose sum is σ = 249524064. Its totient is φ = 55449784.

The previous prime is 138624457. The next prime is 138624481. The reversal of 138624470 is 74426831.

138624470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 138624470.

It is a congruent number.

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, 6931214 + ... + 6931233.

It is an arithmetic number, because the mean of its divisors is an integer number (31190508).

Almost surely, 2^138624470 is an apocalyptic number.

138624470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138624470 is a deficient number, since it is larger than the sum of its proper divisors (110899594).

138624470 is a wasteful number, since it uses less digits than its factorization.

138624470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13862454.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 138624470 is about 11773.8893319073. The cubic root of 138624470 is about 517.5432311586.

The spelling of 138624470 in words is "one hundred thirty-eight million, six hundred twenty-four thousand, four hundred seventy".