156221842 has 16 divisors (see below), whose sum is σ = 279453312. Its totient is φ = 64041120.

The previous prime is 156221839. The next prime is 156221873. The reversal of 156221842 is 248122651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242259 + ... + 242902.

It is an arithmetic number, because the mean of its divisors is an integer number (17465832).

Almost surely, 2^156221842 is an apocalyptic number.

156221842 is a deficient number, since it is larger than the sum of its proper divisors (123231470).

156221842 is a wasteful number, since it uses less digits than its factorization.

156221842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485193.

The product of its digits is 7680, while the sum is 31.

The square root of 156221842 is about 12498.8736292516. The cubic root of 156221842 is about 538.5763161258.

The spelling of 156221842 in words is "one hundred fifty-six million, two hundred twenty-one thousand, eight hundred forty-two".