138415539 has 8 divisors (see below), whose sum is σ = 184879552. Its totient is φ = 92114280.

The previous prime is 138415523. The next prime is 138415553. The reversal of 138415539 is 935514831.

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

It is not a de Polignac number, because 138415539 - 2⁴ = 138415523 is a prime.

It is a super-2 number, since 2×138415539² = 38317722873321042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138415497 and 138415506.

It is not an unprimeable number, because it can be changed into a prime (138415339) 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, 38689 + ... + 42114.

It is an arithmetic number, because the mean of its divisors is an integer number (23109944).

Almost surely, 2^138415539 is an apocalyptic number.

138415539 is a deficient number, since it is larger than the sum of its proper divisors (46464013).

138415539 is an equidigital number, since it uses as much as digits as its factorization.

138415539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81377.

The product of its digits is 64800, while the sum is 39.

The square root of 138415539 is about 11765.0133446588. The cubic root of 138415539 is about 517.2830914341.

The spelling of 138415539 in words is "one hundred thirty-eight million, four hundred fifteen thousand, five hundred thirty-nine".