138340872 has 64 divisors (see below), whose sum is σ = 389073600. Its totient is φ = 46107792.

The previous prime is 138340801. The next prime is 138340889. The reversal of 138340872 is 278043831.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 13543 + ... + 21449.

It is an arithmetic number, because the mean of its divisors is an integer number (6079275).

Almost surely, 2^138340872 is an apocalyptic number.

138340872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138340872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194536800).

138340872 is an abundant number, since it is smaller than the sum of its proper divisors (250732728).

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

138340872 is an frugal number, since it uses more digits than its factorization.

138340872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7934 (or 7912 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 138340872 is about 11761.8396520272. The cubic root of 138340872 is about 517.1900601553.

The spelling of 138340872 in words is "one hundred thirty-eight million, three hundred forty thousand, eight hundred seventy-two".