138203390 has 32 divisors (see below), whose sum is σ = 271313280. Its totient is φ = 50379264.

The previous prime is 138203341. The next prime is 138203411. The reversal of 138203390 is 93302831.

It is a congruent 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, 3542 + ... + 16998.

It is an arithmetic number, because the mean of its divisors is an integer number (8478540).

Almost surely, 2^138203390 is an apocalyptic number.

138203390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138203390 is a deficient number, since it is larger than the sum of its proper divisors (133109890).

138203390 is a wasteful number, since it uses less digits than its factorization.

138203390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13556.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 138203390 is about 11755.9937904033. The cubic root of 138203390 is about 517.0186769863.

The spelling of 138203390 in words is "one hundred thirty-eight million, two hundred three thousand, three hundred ninety".