138821289362 has 54 divisors (see below), whose sum is σ = 246664829151. Its totient is φ = 58424667840.

The previous prime is 138821289329. The next prime is 138821289367. The reversal of 138821289362 is 263982128831.

It can be written as a sum of positive squares in 5 ways, for example, as 24448136881 + 114373152481 = 156359^2 + 338191^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=263459.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138821289367) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 224993678 + ... + 224994294.

Almost surely, 2^138821289362 is an apocalyptic number.

138821289362 is a deficient number, since it is larger than the sum of its proper divisors (107843539789).

138821289362 is an frugal number, since it uses more digits than its factorization.

138821289362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372 (or 687 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The spelling of 138821289362 in words is "one hundred thirty-eight billion, eight hundred twenty-one million, two hundred eighty-nine thousand, three hundred sixty-two".