189834390 has 48 divisors (see below), whose sum is σ = 509498496. Its totient is φ = 48988800.

The previous prime is 189834389. The next prime is 189834391. The reversal of 189834390 is 93438981.

189834390 is a `hidden beast` number, since 189 + 83 + 4 + 390 = 666.

It is an interprime number because it is at equal distance from previous prime (189834389) and next prime (189834391).

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 (189834391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31231 + ... + 36810.

It is an arithmetic number, because the mean of its divisors is an integer number (10614552).

Almost surely, 2^189834390 is an apocalyptic number.

189834390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189834390 is an abundant number, since it is smaller than the sum of its proper divisors (319664106).

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

189834390 is a wasteful number, since it uses less digits than its factorization.

189834390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68085 (or 68082 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 189834390 is about 13778.0401363910. The cubic root of 189834390 is about 574.7226286666.

The spelling of 189834390 in words is "one hundred eighty-nine million, eight hundred thirty-four thousand, three hundred ninety".