18213065 has 16 divisors (see below), whose sum is σ = 24176208. Its totient is φ = 13084416.

The previous prime is 18213053. The next prime is 18213067. The reversal of 18213065 is 56031281.

It can be written as a sum of positive squares in 8 ways, for example, as 1923769 + 16289296 = 1387^2 + 4036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18213065 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18213067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1382 + ... + 6191.

It is an arithmetic number, because the mean of its divisors is an integer number (1511013).

Almost surely, 2^18213065 is an apocalyptic number.

It is an amenable number.

18213065 is a deficient number, since it is larger than the sum of its proper divisors (5963143).

18213065 is a wasteful number, since it uses less digits than its factorization.

18213065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 18213065 is about 4267.6767684538. The cubic root of 18213065 is about 263.1041383776.

The spelling of 18213065 in words is "eighteen million, two hundred thirteen thousand, sixty-five".