189805992 has 32 divisors (see below), whose sum is σ = 475968480. Its totient is φ = 63074880.

The previous prime is 189805981. The next prime is 189805997. The reversal of 189805992 is 299508981.

It is not an unprimeable number, because it can be changed into a prime (189805997) 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, 4003 + ... + 19890.

It is an arithmetic number, because the mean of its divisors is an integer number (14874015).

Almost surely, 2^189805992 is an apocalyptic number.

189805992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

189805992 is an abundant number, since it is smaller than the sum of its proper divisors (286162488).

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

189805992 is a wasteful number, since it uses less digits than its factorization.

189805992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24233 (or 24229 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 51.

The square root of 189805992 is about 13777.0095448904. The cubic root of 189805992 is about 574.6939689717.

The spelling of 189805992 in words is "one hundred eighty-nine million, eight hundred five thousand, nine hundred ninety-two".