138925020 has 96 divisors (see below), whose sum is σ = 443596608. Its totient is φ = 32182272.

The previous prime is 138925001. The next prime is 138925057. The reversal of 138925020 is 20529831.

It is a happy number.

It is a super-2 number, since 2×138925020² = 38600322364000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8022 + ... + 18498.

It is an arithmetic number, because the mean of its divisors is an integer number (4620798).

Almost surely, 2^138925020 is an apocalyptic number.

138925020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138925020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221798304).

138925020 is an abundant number, since it is smaller than the sum of its proper divisors (304671588).

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

138925020 is a wasteful number, since it uses less digits than its factorization.

138925020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10519 (or 10517 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 138925020 is about 11786.6458333149. The cubic root of 138925020 is about 517.9169875373.

The spelling of 138925020 in words is "one hundred thirty-eight million, nine hundred twenty-five thousand, twenty".