188913890 has 16 divisors (see below), whose sum is σ = 370958400. Its totient is φ = 68695920.

The previous prime is 188913887. The next prime is 188913899. The reversal of 188913890 is 98319881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (188913899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858590 + ... + 858809.

It is an arithmetic number, because the mean of its divisors is an integer number (23184900).

Almost surely, 2^188913890 is an apocalyptic number.

188913890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188913890 is a deficient number, since it is larger than the sum of its proper divisors (182044510).

188913890 is a wasteful number, since it uses less digits than its factorization.

188913890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717417.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 188913890 is about 13744.5949376473. The cubic root of 188913890 is about 573.7921868281.

The spelling of 188913890 in words is "one hundred eighty-eight million, nine hundred thirteen thousand, eight hundred ninety".