188116905 has 16 divisors (see below), whose sum is σ = 305481024. Its totient is φ = 98831040.

The previous prime is 188116871. The next prime is 188116919. The reversal of 188116905 is 509611881.

It is not a de Polignac number, because 188116905 - 2¹² = 188112809 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92586 + ... + 94595.

It is an arithmetic number, because the mean of its divisors is an integer number (19092564).

Almost surely, 2^188116905 is an apocalyptic number.

188116905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188116905 is a deficient number, since it is larger than the sum of its proper divisors (117364119).

188116905 is a wasteful number, since it uses less digits than its factorization.

188116905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187256.

The product of its (nonzero) digits is 17280, while the sum is 39.

The square root of 188116905 is about 13715.5716249816. The cubic root of 188116905 is about 572.9841496062.

The spelling of 188116905 in words is "one hundred eighty-eight million, one hundred sixteen thousand, nine hundred five".