189406998 has 80 divisors (see below), whose sum is σ = 466632144. Its totient is φ = 56946240.

The previous prime is 189406969. The next prime is 189406999. The reversal of 189406998 is 899604981.

189406998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189406999) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 279436 + ... + 280112.

Almost surely, 2^189406998 is an apocalyptic number.

189406998 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 189406998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233316072).

189406998 is an abundant number, since it is smaller than the sum of its proper divisors (277225146).

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

189406998 is a wasteful number, since it uses less digits than its factorization.

189406998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 189406998 is about 13762.5214986208. The cubic root of 189406998 is about 574.2909955597.

The spelling of 189406998 in words is "one hundred eighty-nine million, four hundred six thousand, nine hundred ninety-eight".