138266790 has 32 divisors (see below), whose sum is σ = 333770976. Its totient is φ = 36656640.

The previous prime is 138266773. The next prime is 138266833. The reversal of 138266790 is 97662831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8131 + ... + 18510.

It is an arithmetic number, because the mean of its divisors is an integer number (10430343).

Almost surely, 2^138266790 is an apocalyptic number.

138266790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138266790 is an abundant number, since it is smaller than the sum of its proper divisors (195504186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138266790 is a wasteful number, since it uses less digits than its factorization.

138266790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26824.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 138266790 is about 11758.6899780545. The cubic root of 138266790 is about 517.0977246686.

The spelling of 138266790 in words is "one hundred thirty-eight million, two hundred sixty-six thousand, seven hundred ninety".