138548840 has 32 divisors (see below), whose sum is σ = 319341960. Its totient is φ = 54067200.

The previous prime is 138548821. The next prime is 138548867. The reversal of 138548840 is 48845831.

It can be written as a sum of positive squares in 4 ways, for example, as 35688676 + 102860164 = 5974^2 + 10142^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

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, 40601 + ... + 43880.

Almost surely, 2^138548840 is an apocalyptic number.

138548840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138548840 is an abundant number, since it is smaller than the sum of its proper divisors (180793120).

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

138548840 is a wasteful number, since it uses less digits than its factorization.

138548840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84533 (or 84529 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

The square root of 138548840 is about 11770.6771258072. The cubic root of 138548840 is about 517.4490945438.

The spelling of 138548840 in words is "one hundred thirty-eight million, five hundred forty-eight thousand, eight hundred forty".