138422881 has 8 divisors (see below), whose sum is σ = 139540320. Its totient is φ = 137309952.

The previous prime is 138422831. The next prime is 138422897. The reversal of 138422881 is 188224831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138422881 - 2²³ = 130034273 is a prime.

It is a super-2 number, since 2×138422881² = 38321787968680322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138422881.

It is not an unprimeable number, because it can be changed into a prime (138422831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84690 + ... + 86308.

It is an arithmetic number, because the mean of its divisors is an integer number (17442540).

Almost surely, 2^138422881 is an apocalyptic number.

It is an amenable number.

138422881 is a deficient number, since it is larger than the sum of its proper divisors (1117439).

138422881 is a wasteful number, since it uses less digits than its factorization.

138422881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255.

The product of its digits is 24576, while the sum is 37.

The square root of 138422881 is about 11765.3253673666. The cubic root of 138422881 is about 517.2922373853.

The spelling of 138422881 in words is "one hundred thirty-eight million, four hundred twenty-two thousand, eight hundred eighty-one".