18621065 has 4 divisors (see below), whose sum is σ = 22345284. Its totient is φ = 14896848.

The previous prime is 18621047. The next prime is 18621079. The reversal of 18621065 is 56012681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2524921 + 16096144 = 1589^2 + 4012^2 .

It is a cyclic number.

It is not a de Polignac number, because 18621065 - 2⁸ = 18620809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1862102 + ... + 1862111.

It is an arithmetic number, because the mean of its divisors is an integer number (5586321).

Almost surely, 2^18621065 is an apocalyptic number.

It is an amenable number.

18621065 is a deficient number, since it is larger than the sum of its proper divisors (3724219).

18621065 is an equidigital number, since it uses as much as digits as its factorization.

18621065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724218.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18621065 is about 4315.2132044663. The cubic root of 18621065 is about 265.0542905262.

The spelling of 18621065 in words is "eighteen million, six hundred twenty-one thousand, sixty-five".