138548920 has 32 divisors (see below), whose sum is σ = 321793920. Its totient is φ = 53631360.

The previous prime is 138548899. The next prime is 138548947. The reversal of 138548920 is 29845831.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 54627 + ... + 57106.

It is an arithmetic number, because the mean of its divisors is an integer number (10056060).

Almost surely, 2^138548920 is an apocalyptic number.

138548920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138548920 is an abundant number, since it is smaller than the sum of its proper divisors (183245000).

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

138548920 is a wasteful number, since it uses less digits than its factorization.

138548920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111775 (or 111771 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 138548920 is about 11770.6805240819. The cubic root of 138548920 is about 517.4491941379.

It can be divided in two parts, 1385 and 48920, that added together give a palindrome (50305).

The spelling of 138548920 in words is "one hundred thirty-eight million, five hundred forty-eight thousand, nine hundred twenty".