122638839 has 8 divisors (see below), whose sum is σ = 166997760. Its totient is φ = 80019576.

The previous prime is 122638801. The next prime is 122638861. The reversal of 122638839 is 938836221.

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

It is a de Polignac number, because none of the positive numbers 2^k-122638839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122638839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122633839) 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, 434749 + ... + 435030.

It is an arithmetic number, because the mean of its divisors is an integer number (20874720).

Almost surely, 2^122638839 is an apocalyptic number.

122638839 is a deficient number, since it is larger than the sum of its proper divisors (44358921).

122638839 is an equidigital number, since it uses as much as digits as its factorization.

122638839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869829.

The product of its digits is 124416, while the sum is 42.

The square root of 122638839 is about 11074.2421411129. The cubic root of 122638839 is about 496.8317521474.

The spelling of 122638839 in words is "one hundred twenty-two million, six hundred thirty-eight thousand, eight hundred thirty-nine".