138947472 has 30 divisors (see below), whose sum is σ = 388860342. Its totient is φ = 46315776.

The previous prime is 138947467. The next prime is 138947489. The reversal of 138947472 is 274749831.

138947472 is a `hidden beast` number, since 138 + 9 + 47 + 472 = 666.

It can be written as a sum of positive squares in only one way, i.e., 134931456 + 4016016 = 11616^2 + 2004^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 482313 + ... + 482600.

Almost surely, 2^138947472 is an apocalyptic number.

138947472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138947472 is an abundant number, since it is smaller than the sum of its proper divisors (249912870).

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

138947472 is a wasteful number, since it uses less digits than its factorization.

138947472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964927 (or 964918 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 138947472 is about 11787.5982286469. The cubic root of 138947472 is about 517.9448866295.

The spelling of 138947472 in words is "one hundred thirty-eight million, nine hundred forty-seven thousand, four hundred seventy-two".