18989266 has 4 divisors (see below), whose sum is σ = 28483902. Its totient is φ = 9494632.

The previous prime is 18989249. The next prime is 18989291. The reversal of 18989266 is 66298981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66298981 = 7 ⋅9471283.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 1525225 = 4179^2 + 1235^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4747315 + ... + 4747318.

Almost surely, 2^18989266 is an apocalyptic number.

18989266 is a deficient number, since it is larger than the sum of its proper divisors (9494636).

18989266 is an equidigital number, since it uses as much as digits as its factorization.

18989266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494635.

The product of its digits is 373248, while the sum is 49.

The square root of 18989266 is about 4357.6674953466. The cubic root of 18989266 is about 266.7899051900.

The spelling of 18989266 in words is "eighteen million, nine hundred eighty-nine thousand, two hundred sixty-six".