188900890 has 32 divisors (see below), whose sum is σ = 347146560. Its totient is φ = 73987584.

The previous prime is 188900879. The next prime is 188900891. The reversal of 188900890 is 98009881.

It is not an unprimeable number, because it can be changed into a prime (188900891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207817 + ... + 208723.

It is an arithmetic number, because the mean of its divisors is an integer number (10848330).

Almost surely, 2^188900890 is an apocalyptic number.

188900890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188900890 is a deficient number, since it is larger than the sum of its proper divisors (158245670).

188900890 is a wasteful number, since it uses less digits than its factorization.

188900890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 188900890 is about 13744.1220163385. The cubic root of 188900890 is about 573.7790248005.

The spelling of 188900890 in words is "one hundred eighty-eight million, nine hundred thousand, eight hundred ninety".