138892990 has 16 divisors (see below), whose sum is σ = 255327552. Its totient is φ = 54374944.

The previous prime is 138892987. The next prime is 138892993. The reversal of 138892990 is 99298831.

It is an interprime number because it is at equal distance from previous prime (138892987) and next prime (138892993).

It is a super-2 number, since 2×138892990² = 38582525342280200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138892993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147289 + ... + 148228.

It is an arithmetic number, because the mean of its divisors is an integer number (15957972).

Almost surely, 2^138892990 is an apocalyptic number.

138892990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138892990 is a deficient number, since it is larger than the sum of its proper divisors (116434562).

138892990 is a wasteful number, since it uses less digits than its factorization.

138892990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295571.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 138892990 is about 11785.2870139000. The cubic root of 138892990 is about 517.8771815178.

The spelling of 138892990 in words is "one hundred thirty-eight million, eight hundred ninety-two thousand, nine hundred ninety".