188818947 has 12 divisors (see below), whose sum is σ = 274317264. Its totient is φ = 125150640.

The previous prime is 188818933. The next prime is 188818957. The reversal of 188818947 is 749818881.

It is a happy number.

It is not a de Polignac number, because 188818947 - 2²⁴ = 172041731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188818893 and 188818902.

It is not an unprimeable number, because it can be changed into a prime (188818907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59079 + ... + 62192.

It is an arithmetic number, because the mean of its divisors is an integer number (22859772).

Almost surely, 2^188818947 is an apocalyptic number.

188818947 is a deficient number, since it is larger than the sum of its proper divisors (85498317).

188818947 is a wasteful number, since it uses less digits than its factorization.

188818947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121450 (or 121447 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 54.

The square root of 188818947 is about 13741.1406731756. The cubic root of 188818947 is about 573.6960465876.

The spelling of 188818947 in words is "one hundred eighty-eight million, eight hundred eighteen thousand, nine hundred forty-seven".