138025520 has 40 divisors (see below), whose sum is σ = 322285920. Its totient is φ = 54973440.

The previous prime is 138025513. The next prime is 138025523. The reversal of 138025520 is 25520831.

138025520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 138025520.

It is not an unprimeable number, because it can be changed into a prime (138025523) 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, 15701 + ... + 22859.

It is an arithmetic number, because the mean of its divisors is an integer number (8057148).

Almost surely, 2^138025520 is an apocalyptic number.

138025520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138025520 is an abundant number, since it is smaller than the sum of its proper divisors (184260400).

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

138025520 is a wasteful number, since it uses less digits than its factorization.

138025520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7413 (or 7407 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 138025520 is about 11748.4262775914. The cubic root of 138025520 is about 516.7967779611.

The spelling of 138025520 in words is "one hundred thirty-eight million, twenty-five thousand, five hundred twenty".