189898906 has 8 divisors (see below), whose sum is σ = 284987124. Its totient is φ = 94903200.

The previous prime is 189898897. The next prime is 189898949. The reversal of 189898906 is 609898981.

It can be written as a sum of positive squares in 2 ways, for example, as 186568281 + 3330625 = 13659^2 + 1825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 17745 + ... + 26356.

Almost surely, 2^189898906 is an apocalyptic number.

189898906 is a deficient number, since it is larger than the sum of its proper divisors (95088218).

189898906 is a wasteful number, since it uses less digits than its factorization.

189898906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46256.

The product of its (nonzero) digits is 2239488, while the sum is 58.

The square root of 189898906 is about 13780.3811993718. The cubic root of 189898906 is about 574.7877285772.

The spelling of 189898906 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred six".