188643442 has 16 divisors (see below), whose sum is σ = 306335232. Its totient is φ = 86608080.

The previous prime is 188643359. The next prime is 188643467. The reversal of 188643442 is 244346881.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 188643395 and 188643404.

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, 14028 + ... + 23959.

It is an arithmetic number, because the mean of its divisors is an integer number (19145952).

Almost surely, 2^188643442 is an apocalyptic number.

188643442 is a deficient number, since it is larger than the sum of its proper divisors (117691790).

188643442 is a wasteful number, since it uses less digits than its factorization.

188643442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38193.

The product of its digits is 147456, while the sum is 40.

The square root of 188643442 is about 13734.7530738634. The cubic root of 188643442 is about 573.5182435687.

The spelling of 188643442 in words is "one hundred eighty-eight million, six hundred forty-three thousand, four hundred forty-two".