189423390 has 32 divisors (see below), whose sum is σ = 489587616. Its totient is φ = 46627200.

The previous prime is 189423371. The next prime is 189423391. The reversal of 189423390 is 93324981.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189423391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242461 + ... + 243240.

It is an arithmetic number, because the mean of its divisors is an integer number (15299613).

Almost surely, 2^189423390 is an apocalyptic number.

189423390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189423390 is an abundant number, since it is smaller than the sum of its proper divisors (300164226).

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

189423390 is a wasteful number, since it uses less digits than its factorization.

189423390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485724.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 189423390 is about 13763.1170161414. The cubic root of 189423390 is about 574.3075621888.

The spelling of 189423390 in words is "one hundred eighty-nine million, four hundred twenty-three thousand, three hundred ninety".