138243813442 has 32 divisors (see below), whose sum is σ = 251193664512. Its totient is φ = 55703606784.

The previous prime is 138243813359. The next prime is 138243813457. The reversal of 138243813442 is 244318342831.

It is a super-2 number, since 2×138243813442² (a number of 23 digits) contains 22 as substring.

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, 77938 + ... + 531565.

It is an arithmetic number, because the mean of its divisors is an integer number (7849802016).

Almost surely, 2^138243813442 is an apocalyptic number.

138243813442 is a deficient number, since it is larger than the sum of its proper divisors (112949851070).

138243813442 is a wasteful number, since it uses less digits than its factorization.

138243813442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610482.

The product of its digits is 442368, while the sum is 43.

The spelling of 138243813442 in words is "one hundred thirty-eight billion, two hundred forty-three million, eight hundred thirteen thousand, four hundred forty-two".