138996020 has 24 divisors (see below), whose sum is σ = 307255200. Its totient is φ = 52672032.

The previous prime is 138995999. The next prime is 138996041. The reversal of 138996020 is 20699831.

It is an interprime number because it is at equal distance from previous prime (138995999) and next prime (138996041).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182510 + ... + 183269.

It is an arithmetic number, because the mean of its divisors is an integer number (12802300).

Almost surely, 2^138996020 is an apocalyptic number.

138996020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138996020 is an abundant number, since it is smaller than the sum of its proper divisors (168259180).

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

138996020 is a wasteful number, since it uses less digits than its factorization.

138996020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365807 (or 365805 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 138996020 is about 11789.6573317463. The cubic root of 138996020 is about 518.0052026132.

The spelling of 138996020 in words is "one hundred thirty-eight million, nine hundred ninety-six thousand, twenty".