138912553 has 8 divisors (see below), whose sum is σ = 157472000. Its totient is φ = 121477968.

The previous prime is 138912517. The next prime is 138912563. The reversal of 138912553 is 355219831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138912553 - 2⁹ = 138912041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138912563) 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, 280953 + ... + 281446.

It is an arithmetic number, because the mean of its divisors is an integer number (19684000).

Almost surely, 2^138912553 is an apocalyptic number.

138912553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138912553 is a deficient number, since it is larger than the sum of its proper divisors (18559447).

138912553 is a wasteful number, since it uses less digits than its factorization.

138912553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562431.

The product of its digits is 32400, while the sum is 37.

The square root of 138912553 is about 11786.1169602206. The cubic root of 138912553 is about 517.9014946135.

The spelling of 138912553 in words is "one hundred thirty-eight million, nine hundred twelve thousand, five hundred fifty-three".