189904992 has 48 divisors (see below), whose sum is σ = 515697840. Its totient is φ = 61117952.

The previous prime is 189904973. The next prime is 189904993. The reversal of 189904992 is 299409981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×189904992³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189904993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31323 + ... + 36890.

It is an arithmetic number, because the mean of its divisors is an integer number (10743705).

Almost surely, 2^189904992 is an apocalyptic number.

189904992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

189904992 is an abundant number, since it is smaller than the sum of its proper divisors (325792848).

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

189904992 is a wasteful number, since it uses less digits than its factorization.

189904992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68255 (or 68247 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 51.

The square root of 189904992 is about 13780.6020187799. The cubic root of 189904992 is about 574.7938688983.

The spelling of 189904992 in words is "one hundred eighty-nine million, nine hundred four thousand, nine hundred ninety-two".