138926290 has 16 divisors (see below), whose sum is σ = 263229120. Its totient is φ = 52645680.

The previous prime is 138926287. The next prime is 138926299. The reversal of 138926290 is 92629831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138926299) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 365406 + ... + 365785.

It is an arithmetic number, because the mean of its divisors is an integer number (16451820).

Almost surely, 2^138926290 is an apocalyptic number.

138926290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138926290 is a deficient number, since it is larger than the sum of its proper divisors (124302830).

138926290 is a wasteful number, since it uses less digits than its factorization.

138926290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731217.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 138926290 is about 11786.6997077214. The cubic root of 138926290 is about 517.9185657329.

The spelling of 138926290 in words is "one hundred thirty-eight million, nine hundred twenty-six thousand, two hundred ninety".