189916890 has 32 divisors (see below), whose sum is σ = 458870400. Its totient is φ = 50303424.

The previous prime is 189916823. The next prime is 189916907. The reversal of 189916890 is 98619981.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16774 + ... + 25713.

It is an arithmetic number, because the mean of its divisors is an integer number (14339700).

Almost surely, 2^189916890 is an apocalyptic number.

189916890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189916890 is an abundant number, since it is smaller than the sum of its proper divisors (268953510).

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

189916890 is a wasteful number, since it uses less digits than its factorization.

189916890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42646.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 189916890 is about 13781.0337057856. The cubic root of 189916890 is about 574.8058727158.

The spelling of 189916890 in words is "one hundred eighty-nine million, nine hundred sixteen thousand, eight hundred ninety".