122638689 has 6 divisors (see below), whose sum is σ = 177144786. Its totient is φ = 81759120.

The previous prime is 122638687. The next prime is 122638699. The reversal of 122638689 is 986836221.

122638689 is a `hidden beast` number, since 1 + 2 + 2 + 638 + 6 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106502400 + 16136289 = 10320^2 + 4017^2 .

It is not a de Polignac number, because 122638689 - 2¹ = 122638687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122638687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6813252 + ... + 6813269.

It is an arithmetic number, because the mean of its divisors is an integer number (29524131).

Almost surely, 2^122638689 is an apocalyptic number.

It is an amenable number.

122638689 is a deficient number, since it is larger than the sum of its proper divisors (54506097).

122638689 is a wasteful number, since it uses less digits than its factorization.

122638689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13626527 (or 13626524 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 122638689 is about 11074.2353686383. The cubic root of 122638689 is about 496.8315495884.

The spelling of 122638689 in words is "one hundred twenty-two million, six hundred thirty-eight thousand, six hundred eighty-nine".