138326540 has 24 divisors (see below), whose sum is σ = 316894032. Its totient is φ = 50300480.

The previous prime is 138326537. The next prime is 138326581. The reversal of 138326540 is 45623831.

It is a junction number, because it is equal to n+sod(n) for n = 138326497 and 138326506.

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, 314159 + ... + 314598.

It is an arithmetic number, because the mean of its divisors is an integer number (13203918).

Almost surely, 2^138326540 is an apocalyptic number.

138326540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138326540 is an abundant number, since it is smaller than the sum of its proper divisors (178567492).

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

138326540 is a wasteful number, since it uses less digits than its factorization.

138326540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628777 (or 628775 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 138326540 is about 11761.2303778134. The cubic root of 138326540 is about 517.1721993843.

The spelling of 138326540 in words is "one hundred thirty-eight million, three hundred twenty-six thousand, five hundred forty".