188994971 has 16 divisors (see below), whose sum is σ = 211507200. Its totient is φ = 167428800.

The previous prime is 188994959. The next prime is 188994977. The reversal of 188994971 is 179499881.

It is a de Polignac number, because none of the positive numbers 2^k-188994971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188994977) 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, 68150 + ... + 70868.

It is an arithmetic number, because the mean of its divisors is an integer number (13219200).

Almost surely, 2^188994971 is an apocalyptic number.

188994971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

188994971 is a deficient number, since it is larger than the sum of its proper divisors (22512229).

188994971 is a wasteful number, since it uses less digits than its factorization.

188994971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890.

The product of its digits is 1306368, while the sum is 56.

The square root of 188994971 is about 13747.5441806891. The cubic root of 188994971 is about 573.8742647702.

The spelling of 188994971 in words is "one hundred eighty-eight million, nine hundred ninety-four thousand, nine hundred seventy-one".