188817145 has 8 divisors (see below), whose sum is σ = 247178880. Its totient is φ = 137321520.

The previous prime is 188817131. The next prime is 188817157. The reversal of 188817145 is 541718881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 188817145 - 2²⁷ = 54599417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1716465 + ... + 1716574.

It is an arithmetic number, because the mean of its divisors is an integer number (30897360).

Almost surely, 2^188817145 is an apocalyptic number.

It is an amenable number.

188817145 is a deficient number, since it is larger than the sum of its proper divisors (58361735).

188817145 is a wasteful number, since it uses less digits than its factorization.

188817145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433055.

The product of its digits is 71680, while the sum is 43.

The square root of 188817145 is about 13741.0751034990. The cubic root of 188817145 is about 573.6942215526.

The spelling of 188817145 in words is "one hundred eighty-eight million, eight hundred seventeen thousand, one hundred forty-five".