190918889 has 4 divisors (see below), whose sum is σ = 218193024. Its totient is φ = 163644756.

The previous prime is 190918831. The next prime is 190918913. The reversal of 190918889 is 988819091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 190918889 - 2⁸ = 190918633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190918889.

It is not an unprimeable number, because it can be changed into a prime (190918829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13637057 + ... + 13637070.

It is an arithmetic number, because the mean of its divisors is an integer number (54548256).

Almost surely, 2^190918889 is an apocalyptic number.

It is an amenable number.

190918889 is a deficient number, since it is larger than the sum of its proper divisors (27274135).

190918889 is an equidigital number, since it uses as much as digits as its factorization.

190918889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27274134.

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 190918889 is about 13817.3401564845. The cubic root of 190918889 is about 575.8149894897.

The spelling of 190918889 in words is "one hundred ninety million, nine hundred eighteen thousand, eight hundred eighty-nine".