19892889 has 6 divisors (see below), whose sum is σ = 28734186. Its totient is φ = 13261920.

The previous prime is 19892881. The next prime is 19892897. The reversal of 19892889 is 98829891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19892881) and next prime (19892897).

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 1334025 = 4308^2 + 1155^2 .

It is not a de Polignac number, because 19892889 - 2³ = 19892881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19892881) 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 5 ways as a sum of consecutive naturals, for example, 1105152 + ... + 1105169.

It is an arithmetic number, because the mean of its divisors is an integer number (4789031).

Almost surely, 2^19892889 is an apocalyptic number.

It is an amenable number.

19892889 is a deficient number, since it is larger than the sum of its proper divisors (8841297).

19892889 is a wasteful number, since it uses less digits than its factorization.

19892889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210327 (or 2210324 counting only the distinct ones).

The product of its digits is 746496, while the sum is 54.

The square root of 19892889 is about 4460.1445043855. The cubic root of 19892889 is about 270.9563207154.

The spelling of 19892889 in words is "nineteen million, eight hundred ninety-two thousand, eight hundred eighty-nine".