189799638 has 24 divisors (see below), whose sum is σ = 441575352. Its totient is φ = 54228384.

The previous prime is 189799613. The next prime is 189799651. The reversal of 189799638 is 836997981.

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 11 ways as a sum of consecutive naturals, for example, 322495 + ... + 323082.

It is an arithmetic number, because the mean of its divisors is an integer number (18398973).

Almost surely, 2^189799638 is an apocalyptic number.

189799638 is an abundant number, since it is smaller than the sum of its proper divisors (251775714).

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

189799638 is a wasteful number, since it uses less digits than its factorization.

189799638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645596 (or 645589 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 60.

The square root of 189799638 is about 13776.7789413927. The cubic root of 189799638 is about 574.6875560266.

The spelling of 189799638 in words is "one hundred eighty-nine million, seven hundred ninety-nine thousand, six hundred thirty-eight".