161904412 has 12 divisors (see below), whose sum is σ = 283459176. Its totient is φ = 80916080.

The previous prime is 161904403. The next prime is 161904427. The reversal of 161904412 is 214409161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2763 + ... + 18205.

It is an arithmetic number, because the mean of its divisors is an integer number (23621598).

Almost surely, 2^161904412 is an apocalyptic number.

It is an amenable number.

161904412 is a deficient number, since it is larger than the sum of its proper divisors (121554764).

161904412 is a wasteful number, since it uses less digits than its factorization.

161904412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18068 (or 18066 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 161904412 is about 12724.1664560002. The cubic root of 161904412 is about 545.0289376661.

It can be divided in two parts, 16190 and 4412, that added together give a palindrome (20602).

The spelling of 161904412 in words is "one hundred sixty-one million, nine hundred four thousand, four hundred twelve".