189491836 has 6 divisors (see below), whose sum is σ = 331610720. Its totient is φ = 94745916.

The previous prime is 189491821. The next prime is 189491903. The reversal of 189491836 is 638194981.

It is a self number, because there is not a number n which added to its sum of digits gives 189491836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23686476 + ... + 23686483.

Almost surely, 2^189491836 is an apocalyptic number.

It is an amenable number.

189491836 is a deficient number, since it is larger than the sum of its proper divisors (142118884).

189491836 is a wasteful number, since it uses less digits than its factorization.

189491836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47372963 (or 47372961 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The square root of 189491836 is about 13765.6033649092. The cubic root of 189491836 is about 574.3767270400.

The spelling of 189491836 in words is "one hundred eighty-nine million, four hundred ninety-one thousand, eight hundred thirty-six".