189770490 has 384 divisors, whose sum is σ = 679311360. Its totient is φ = 35610624.

The previous prime is 189770489. The next prime is 189770513. The reversal of 189770490 is 94077981.

189770490 is a `hidden beast` number, since 1 + 8 + 97 + 70 + 490 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4037647 + ... + 4037693.

It is an arithmetic number, because the mean of its divisors is an integer number (1769040).

Almost surely, 2^189770490 is an apocalyptic number.

189770490 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 189770490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339655680).

189770490 is an abundant number, since it is smaller than the sum of its proper divisors (489540870).

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

189770490 is a wasteful number, since it uses less digits than its factorization.

189770490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 189770490 is about 13775.7210337608. The cubic root of 189770490 is about 574.6581357905.

The spelling of 189770490 in words is "one hundred eighty-nine million, seven hundred seventy thousand, four hundred ninety".