18990265 has 8 divisors (see below), whose sum is σ = 26043840. Its totient is φ = 13021872.

The previous prime is 18990247. The next prime is 18990277. The reversal of 18990265 is 56209981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18990265 - 2⁵ = 18990233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271255 + ... + 271324.

It is an arithmetic number, because the mean of its divisors is an integer number (3255480).

Almost surely, 2^18990265 is an apocalyptic number.

It is an amenable number.

18990265 is a deficient number, since it is larger than the sum of its proper divisors (7053575).

18990265 is an equidigital number, since it uses as much as digits as its factorization.

18990265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542591.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 18990265 is about 4357.7821193814. The cubic root of 18990265 is about 266.7945835952.

The spelling of 18990265 in words is "eighteen million, nine hundred ninety thousand, two hundred sixty-five".