138630420 has 48 divisors (see below), whose sum is σ = 431296320. Its totient is φ = 36967968.

The previous prime is 138630347. The next prime is 138630433. The reversal of 138630420 is 24036831.

It is a happy number.

138630420 is a `hidden beast` number, since 1 + 3 + 8 + 630 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127822 + ... + 128901.

It is an arithmetic number, because the mean of its divisors is an integer number (8985340).

Almost surely, 2^138630420 is an apocalyptic number.

138630420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138630420 is an abundant number, since it is smaller than the sum of its proper divisors (292665900).

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

138630420 is a wasteful number, since it uses less digits than its factorization.

138630420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256741 (or 256733 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 138630420 is about 11774.1420069574. The cubic root of 138630420 is about 517.5506356670.

The spelling of 138630420 in words is "one hundred thirty-eight million, six hundred thirty thousand, four hundred twenty".