122939478 has 64 divisors (see below), whose sum is σ = 291453120. Its totient is φ = 38278656.

The previous prime is 122939471. The next prime is 122939491. The reversal of 122939478 is 874939221.

It is a super-2 number, since 2×122939478² = 30228230501824968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122939471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143700 + ... + 144552.

It is an arithmetic number, because the mean of its divisors is an integer number (4553955).

Almost surely, 2^122939478 is an apocalyptic number.

122939478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 122939478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145726560).

122939478 is an abundant number, since it is smaller than the sum of its proper divisors (168513642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122939478 is a wasteful number, since it uses less digits than its factorization.

122939478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1032 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 122939478 is about 11087.8076282013. The cubic root of 122939478 is about 497.2374015449.

The spelling of 122939478 in words is "one hundred twenty-two million, nine hundred thirty-nine thousand, four hundred seventy-eight".