189439992 has 128 divisors (see below), whose sum is σ = 604800000. Its totient is φ = 53820288.

The previous prime is 189439961. The next prime is 189439997. The reversal of 189439992 is 299934981.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189439997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527509 + ... + 527867.

It is an arithmetic number, because the mean of its divisors is an integer number (4725000).

Almost surely, 2^189439992 is an apocalyptic number.

189439992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189439992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302400000).

189439992 is an abundant number, since it is smaller than the sum of its proper divisors (415360008).

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

189439992 is a wasteful number, since it uses less digits than its factorization.

189439992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 720 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 189439992 is about 13763.7201366491. The cubic root of 189439992 is about 574.3243400809.

The spelling of 189439992 in words is "one hundred eighty-nine million, four hundred thirty-nine thousand, nine hundred ninety-two".