138747472 has 20 divisors (see below), whose sum is σ = 284636916. Its totient is φ = 65292800.

The previous prime is 138747467. The next prime is 138747487. The reversal of 138747472 is 274747831.

It can be written as a sum of positive squares in 2 ways, for example, as 56010256 + 82737216 = 7484^2 + 9096^2 .

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, 254779 + ... + 255322.

Almost surely, 2^138747472 is an apocalyptic number.

It is an amenable number.

138747472 is an abundant number, since it is smaller than the sum of its proper divisors (145889444).

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

138747472 is a wasteful number, since it uses less digits than its factorization.

138747472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510126 (or 510120 counting only the distinct ones).

The product of its digits is 263424, while the sum is 43.

The square root of 138747472 is about 11779.1116812772. Note that the first 3 decimals coincide. The cubic root of 138747472 is about 517.6962585752.

The spelling of 138747472 in words is "one hundred thirty-eight million, seven hundred forty-seven thousand, four hundred seventy-two".