138187420 has 24 divisors (see below), whose sum is σ = 331650144. Its totient is φ = 47378496.

The previous prime is 138187411. The next prime is 138187459. The reversal of 138187420 is 24781831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493387 + ... + 493666.

It is an arithmetic number, because the mean of its divisors is an integer number (13818756).

Almost surely, 2^138187420 is an apocalyptic number.

138187420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138187420 is an abundant number, since it is smaller than the sum of its proper divisors (193462724).

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

138187420 is a wasteful number, since it uses less digits than its factorization.

138187420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987069 (or 987067 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 138187420 is about 11755.3145427930. The cubic root of 138187420 is about 516.9987616371.

The spelling of 138187420 in words is "one hundred thirty-eight million, one hundred eighty-seven thousand, four hundred twenty".