138513542 has 4 divisors (see below), whose sum is σ = 207770316. Its totient is φ = 69256770.

The previous prime is 138513511. The next prime is 138513577. The reversal of 138513542 is 245315831.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 138513499 and 138513508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34628384 + ... + 34628387.

It is an arithmetic number, because the mean of its divisors is an integer number (51942579).

Almost surely, 2^138513542 is an apocalyptic number.

138513542 is a deficient number, since it is larger than the sum of its proper divisors (69256774).

138513542 is an equidigital number, since it uses as much as digits as its factorization.

138513542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69256773.

The product of its digits is 14400, while the sum is 32.

The square root of 138513542 is about 11769.1776263255. The cubic root of 138513542 is about 517.4051474191.

The spelling of 138513542 in words is "one hundred thirty-eight million, five hundred thirteen thousand, five hundred forty-two".