138742499440 has 20 divisors (see below), whose sum is σ = 322576311384. Its totient is φ = 55496999744.

The previous prime is 138742499369. The next prime is 138742499453. The reversal of 138742499440 is 44994247831.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867140542 + ... + 867140701.

Almost surely, 2^138742499440 is an apocalyptic number.

138742499440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138742499440 is an abundant number, since it is smaller than the sum of its proper divisors (183833811944).

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

138742499440 is a wasteful number, since it uses less digits than its factorization.

138742499440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734281256 (or 1734281250 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 138742499440 in words is "one hundred thirty-eight billion, seven hundred forty-two million, four hundred ninety-nine thousand, four hundred forty".