138899542 has 4 divisors (see below), whose sum is σ = 208349316. Its totient is φ = 69449770.

The previous prime is 138899539. The next prime is 138899567. The reversal of 138899542 is 245998831.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 34724884 + ... + 34724887.

It is an arithmetic number, because the mean of its divisors is an integer number (52087329).

Almost surely, 2^138899542 is an apocalyptic number.

138899542 is a deficient number, since it is larger than the sum of its proper divisors (69449774).

138899542 is an equidigital number, since it uses as much as digits as its factorization.

138899542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69449773.

The product of its digits is 622080, while the sum is 49.

The square root of 138899542 is about 11785.5649843357. The cubic root of 138899542 is about 517.8853246644.

The spelling of 138899542 in words is "one hundred thirty-eight million, eight hundred ninety-nine thousand, five hundred forty-two".