189261636 has 12 divisors (see below), whose sum is σ = 441610512. Its totient is φ = 63087208.

The previous prime is 189261587. The next prime is 189261673. The reversal of 189261636 is 636162981.

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

It is a super-2 number, since 2×189261636² = 71639933722792992, which contains 22 as substring.

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, 7885890 + ... + 7885913.

It is an arithmetic number, because the mean of its divisors is an integer number (36800876).

Almost surely, 2^189261636 is an apocalyptic number.

It is an amenable number.

189261636 is an abundant number, since it is smaller than the sum of its proper divisors (252348876).

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

189261636 is a wasteful number, since it uses less digits than its factorization.

189261636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15771810 (or 15771808 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 189261636 is about 13757.2394033105. The cubic root of 189261636 is about 574.1440431354.

The spelling of 189261636 in words is "one hundred eighty-nine million, two hundred sixty-one thousand, six hundred thirty-six".