189799644 has 12 divisors (see below), whose sum is σ = 442865864. Its totient is φ = 63266544.

The previous prime is 189799613. The next prime is 189799651. The reversal of 189799644 is 446997981.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 7908307 + ... + 7908330.

Almost surely, 2^189799644 is an apocalyptic number.

It is an amenable number.

189799644 is an abundant number, since it is smaller than the sum of its proper divisors (253066220).

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

189799644 is a wasteful number, since it uses less digits than its factorization.

189799644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15816644 (or 15816642 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 189799644 is about 13776.7791591504. The cubic root of 189799644 is about 574.6875620823.

The spelling of 189799644 in words is "one hundred eighty-nine million, seven hundred ninety-nine thousand, six hundred forty-four".