189149418 has 40 divisors (see below), whose sum is σ = 428239812. Its totient is φ = 62394624.

The previous prime is 189149417. The next prime is 189149431. The reversal of 189149418 is 814941981.

It can be written as a sum of positive squares in 2 ways, for example, as 164019249 + 25130169 = 12807^2 + 5013^2 .

It is not an unprimeable number, because it can be changed into a prime (189149413) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 9696 + ... + 21732.

Almost surely, 2^189149418 is an apocalyptic number.

189149418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189149418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214119906).

189149418 is an abundant number, since it is smaller than the sum of its proper divisors (239090394).

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

189149418 is a wasteful number, since it uses less digits than its factorization.

189149418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12148 (or 12139 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 189149418 is about 13753.1602913658. The cubic root of 189149418 is about 574.0305458701.

The spelling of 189149418 in words is "one hundred eighty-nine million, one hundred forty-nine thousand, four hundred eighteen".