189790398 has 64 divisors (see below), whose sum is σ = 489968640. Its totient is φ = 53330400.

The previous prime is 189790357. The next prime is 189790399. The reversal of 189790398 is 893097981.

189790398 is a `hidden beast` number, since 189 + 79 + 0 + 398 = 666.

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 (189790399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18943 + ... + 27173.

It is an arithmetic number, because the mean of its divisors is an integer number (7655760).

Almost surely, 2^189790398 is an apocalyptic number.

189790398 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 189790398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244984320).

189790398 is an abundant number, since it is smaller than the sum of its proper divisors (300178242).

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

189790398 is a wasteful number, since it uses less digits than its factorization.

189790398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8310 (or 8304 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 189790398 is about 13776.4435904191. The cubic root of 189790398 is about 574.6782300531.

The spelling of 189790398 in words is "one hundred eighty-nine million, seven hundred ninety thousand, three hundred ninety-eight".