138621400 has 48 divisors (see below), whose sum is σ = 341261640. Its totient is φ = 52185600.

The previous prime is 138621361. The next prime is 138621401. The reversal of 138621400 is 4126831.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138621401) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 16986 + ... + 23785.

Almost surely, 2^138621400 is an apocalyptic number.

138621400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138621400 is an abundant number, since it is smaller than the sum of its proper divisors (202640240).

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

138621400 is a wasteful number, since it uses less digits than its factorization.

138621400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40804 (or 40795 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 138621400 is about 11773.7589579539. The cubic root of 138621400 is about 517.5394105983.

The spelling of 138621400 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, four hundred".