138835990 has 16 divisors (see below), whose sum is σ = 251216640. Its totient is φ = 55242880.

The previous prime is 138835973. The next prime is 138835997. The reversal of 138835990 is 99538831.

It is a self number, because there is not a number n which added to its sum of digits gives 138835990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138835997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34435 + ... + 38254.

It is an arithmetic number, because the mean of its divisors is an integer number (15701040).

Almost surely, 2^138835990 is an apocalyptic number.

138835990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138835990 is a deficient number, since it is larger than the sum of its proper divisors (112380650).

138835990 is a wasteful number, since it uses less digits than its factorization.

138835990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72887.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 138835990 is about 11782.8684962534. The cubic root of 138835990 is about 517.8063283179.

The spelling of 138835990 in words is "one hundred thirty-eight million, eight hundred thirty-five thousand, nine hundred ninety".