138903472 has 10 divisors (see below), whose sum is σ = 269125508. Its totient is φ = 69451728.

The previous prime is 138903461. The next prime is 138903473. The reversal of 138903472 is 274309831.

It is not an unprimeable number, because it can be changed into a prime (138903473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4340718 + ... + 4340749.

Almost surely, 2^138903472 is an apocalyptic number.

It is an amenable number.

138903472 is a deficient number, since it is larger than the sum of its proper divisors (130222036).

138903472 is an equidigital number, since it uses as much as digits as its factorization.

138903472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8681475 (or 8681469 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 138903472 is about 11785.7317125412. The cubic root of 138903472 is about 517.8902089381.

The spelling of 138903472 in words is "one hundred thirty-eight million, nine hundred three thousand, four hundred seventy-two".