138156420 has 48 divisors (see below), whose sum is σ = 395841600. Its totient is φ = 35984256.

The previous prime is 138156413. The next prime is 138156437. The reversal of 138156420 is 24651831.

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

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, 24195 + ... + 29354.

It is an arithmetic number, because the mean of its divisors is an integer number (8246700).

Almost surely, 2^138156420 is an apocalyptic number.

138156420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138156420 is an abundant number, since it is smaller than the sum of its proper divisors (257685180).

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

138156420 is a wasteful number, since it uses less digits than its factorization.

138156420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53604 (or 53602 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 138156420 is about 11753.9959162831. The cubic root of 138156420 is about 516.9600987828.

The spelling of 138156420 in words is "one hundred thirty-eight million, one hundred fifty-six thousand, four hundred twenty".