138452500 has 30 divisors (see below), whose sum is σ = 302773394. Its totient is φ = 55380000.

The previous prime is 138452453. The next prime is 138452507. The reversal of 138452500 is 5254831.

It can be written as a sum of positive squares in 5 ways, for example, as 20034576 + 118417924 = 4476^2 + 10882^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138452507) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 25191 + ... + 30190.

Almost surely, 2^138452500 is an apocalyptic number.

138452500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138452500 is an abundant number, since it is smaller than the sum of its proper divisors (164320894).

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

138452500 is an equidigital number, since it uses as much as digits as its factorization.

138452500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55405 (or 55388 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 138452500 is about 11766.5840412585. The cubic root of 138452500 is about 517.3291305781.

The spelling of 138452500 in words is "one hundred thirty-eight million, four hundred fifty-two thousand, five hundred".