189255390 has 64 divisors (see below), whose sum is σ = 506269440. Its totient is φ = 44997120.

The previous prime is 189255389. The next prime is 189255419. The reversal of 189255390 is 93552981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76 + ... + 19455.

It is an arithmetic number, because the mean of its divisors is an integer number (7910460).

Almost surely, 2^189255390 is an apocalyptic number.

189255390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189255390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253134720).

189255390 is an abundant number, since it is smaller than the sum of its proper divisors (317014050).

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

189255390 is a wasteful number, since it uses less digits than its factorization.

189255390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19577.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 189255390 is about 13757.0123936849. The cubic root of 189255390 is about 574.1377271113.

The spelling of 189255390 in words is "one hundred eighty-nine million, two hundred fifty-five thousand, three hundred ninety".