189445816 has 16 divisors (see below), whose sum is σ = 405955440. Its totient is φ = 81191040.

The previous prime is 189445813. The next prime is 189445829. The reversal of 189445816 is 618544981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189445813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1691425 + ... + 1691536.

It is an arithmetic number, because the mean of its divisors is an integer number (25372215).

Almost surely, 2^189445816 is an apocalyptic number.

It is an amenable number.

189445816 is an abundant number, since it is smaller than the sum of its proper divisors (216509624).

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

189445816 is a wasteful number, since it uses less digits than its factorization.

189445816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382974 (or 3382970 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The square root of 189445816 is about 13763.9317057300. The cubic root of 189445816 is about 574.3302255518.

The spelling of 189445816 in words is "one hundred eighty-nine million, four hundred forty-five thousand, eight hundred sixteen".