18865266 has 16 divisors (see below), whose sum is σ = 43120704. Its totient is φ = 5390064.

The previous prime is 18865247. The next prime is 18865303. The reversal of 18865266 is 66256881.

It is a super-2 number, since 2×18865266² = 711796522501512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 449173 = 18865266 / (1 + 8 + 8 + 6 + 5 + 2 + 6 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224545 + ... + 224628.

It is an arithmetic number, because the mean of its divisors is an integer number (2695044).

Almost surely, 2^18865266 is an apocalyptic number.

18865266 is an abundant number, since it is smaller than the sum of its proper divisors (24255438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18865266 is a wasteful number, since it uses less digits than its factorization.

18865266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449185.

The product of its digits is 138240, while the sum is 42.

The square root of 18865266 is about 4343.4163972615. The cubic root of 18865266 is about 266.2079234352.

The spelling of 18865266 in words is "eighteen million, eight hundred sixty-five thousand, two hundred sixty-six".