122156442 has 12 divisors (see below), whose sum is σ = 264672330. Its totient is φ = 40718808.

The previous prime is 122156413. The next prime is 122156449. The reversal of 122156442 is 244651221.

122156442 is a `hidden beast` number, since 1 + 2 + 2 + 15 + 644 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 114254721 + 7901721 = 10689^2 + 2811^2 .

It is not an unprimeable number, because it can be changed into a prime (122156449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3393217 + ... + 3393252.

Almost surely, 2^122156442 is an apocalyptic number.

122156442 is an abundant number, since it is smaller than the sum of its proper divisors (142515888).

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

122156442 is a wasteful number, since it uses less digits than its factorization.

122156442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786477 (or 6786474 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 122156442 is about 11052.4405449656. The cubic root of 122156442 is about 496.1794708015.

The spelling of 122156442 in words is "one hundred twenty-two million, one hundred fifty-six thousand, four hundred forty-two".