138738435 has 16 divisors (see below), whose sum is σ = 242161920. Its totient is φ = 67267040.

The previous prime is 138738409. The next prime is 138738463. The reversal of 138738435 is 534837831.

It is not a de Polignac number, because 138738435 - 2⁵ = 138738403 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420255 + ... + 420584.

It is an arithmetic number, because the mean of its divisors is an integer number (15135120).

Almost surely, 2^138738435 is an apocalyptic number.

138738435 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138738435 is a deficient number, since it is larger than the sum of its proper divisors (103423485).

138738435 is a wasteful number, since it uses less digits than its factorization.

138738435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840858.

The product of its digits is 241920, while the sum is 42.

The square root of 138738435 is about 11778.7280722496. The cubic root of 138738435 is about 517.6850186763.

The spelling of 138738435 in words is "one hundred thirty-eight million, seven hundred thirty-eight thousand, four hundred thirty-five".