138509472940 has 48 divisors (see below), whose sum is σ = 307516053600. Its totient is φ = 52258563072.

The previous prime is 138509472923. The next prime is 138509472949. The reversal of 138509472940 is 49274905831.

It is not an unprimeable number, because it can be changed into a prime (138509472949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708829 + ... + 882868.

It is an arithmetic number, because the mean of its divisors is an integer number (6406584450).

Almost surely, 2^138509472940 is an apocalyptic number.

138509472940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138509472940 is an abundant number, since it is smaller than the sum of its proper divisors (169006580660).

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

138509472940 is a wasteful number, since it uses less digits than its factorization.

138509472940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591954 (or 1591952 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 138509472940 in words is "one hundred thirty-eight billion, five hundred nine million, four hundred seventy-two thousand, nine hundred forty".