189481590 has 96 divisors (see below), whose sum is σ = 517570560. Its totient is φ = 48003648.

The previous prime is 189481577. The next prime is 189481597. The reversal of 189481590 is 95184981.

189481590 is a `hidden beast` number, since 1 + 89 + 481 + 5 + 90 = 666.

189481590 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 (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189481597) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 494539 + ... + 494921.

It is an arithmetic number, because the mean of its divisors is an integer number (5391360).

Almost surely, 2^189481590 is an apocalyptic number.

189481590 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 189481590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258785280).

189481590 is an abundant number, since it is smaller than the sum of its proper divisors (328088970).

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

189481590 is a wasteful number, since it uses less digits than its factorization.

189481590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 189481590 is about 13765.2312003831. The cubic root of 189481590 is about 574.3663744919.

The spelling of 189481590 in words is "one hundred eighty-nine million, four hundred eighty-one thousand, five hundred ninety".