161442444 has 48 divisors (see below), whose sum is σ = 381886848. Its totient is φ = 53079168.

The previous prime is 161442439. The next prime is 161442499. The reversal of 161442444 is 444244161.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465079 + ... + 465425.

It is an arithmetic number, because the mean of its divisors is an integer number (7955976).

Almost surely, 2^161442444 is an apocalyptic number.

161442444 is the 6792-nd nonagonal number.

It is an amenable number.

161442444 is an abundant number, since it is smaller than the sum of its proper divisors (220444404).

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

161442444 is a wasteful number, since it uses less digits than its factorization.

161442444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 772 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

The square root of 161442444 is about 12706.0003148119. Note that the first 3 decimals coincide. The cubic root of 161442444 is about 544.5100599278.

The spelling of 161442444 in words is "one hundred sixty-one million, four hundred forty-two thousand, four hundred forty-four".