138816290 has 16 divisors (see below), whose sum is σ = 251268480. Its totient is φ = 55215600.

The previous prime is 138816281. The next prime is 138816323. The reversal of 138816290 is 92618831.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36986 + ... + 40565.

It is an arithmetic number, because the mean of its divisors is an integer number (15704280).

Almost surely, 2^138816290 is an apocalyptic number.

138816290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138816290 is a deficient number, since it is larger than the sum of its proper divisors (112452190).

138816290 is a wasteful number, since it uses less digits than its factorization.

138816290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77737.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 138816290 is about 11782.0325071696. The cubic root of 138816290 is about 517.7818359482.

The spelling of 138816290 in words is "one hundred thirty-eight million, eight hundred sixteen thousand, two hundred ninety".