138305472 has 56 divisors (see below), whose sum is σ = 387467856. Its totient is φ = 43388928.

The previous prime is 138305471. The next prime is 138305491. The reversal of 138305472 is 274503831.

138305472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138305471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17923 + ... + 24450.

Almost surely, 2^138305472 is an apocalyptic number.

138305472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138305472 is an abundant number, since it is smaller than the sum of its proper divisors (249162384).

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

138305472 is a wasteful number, since it uses less digits than its factorization.

138305472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42405 (or 42395 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 138305472 is about 11760.3346891149. The cubic root of 138305472 is about 517.1459418608.

The spelling of 138305472 in words is "one hundred thirty-eight million, three hundred five thousand, four hundred seventy-two".