122791439 has 4 divisors (see below), whose sum is σ = 123075456. Its totient is φ = 122507424.

The previous prime is 122791393. The next prime is 122791451. The reversal of 122791439 is 934197221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122791439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122791489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141359 + ... + 142224.

It is an arithmetic number, because the mean of its divisors is an integer number (30768864).

Almost surely, 2^122791439 is an apocalyptic number.

122791439 is a deficient number, since it is larger than the sum of its proper divisors (284017).

122791439 is an equidigital number, since it uses as much as digits as its factorization.

122791439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284016.

The product of its digits is 27216, while the sum is 38.

The square root of 122791439 is about 11081.1298611649. The cubic root of 122791439 is about 497.0377366502.

The spelling of 122791439 in words is "one hundred twenty-two million, seven hundred ninety-one thousand, four hundred thirty-nine".