18772065 has 24 divisors (see below), whose sum is σ = 35042280. Its totient is φ = 9241344.

The previous prime is 18772049. The next prime is 18772069. The reversal of 18772065 is 56027781.

It can be written as a sum of positive squares in 4 ways, for example, as 853776 + 17918289 = 924^2 + 4233^2 .

It is not a de Polignac number, because 18772065 - 2⁴ = 18772049 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772069) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 15460 + ... + 16629.

It is an arithmetic number, because the mean of its divisors is an integer number (1460095).

Almost surely, 2^18772065 is an apocalyptic number.

18772065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18772065 is a deficient number, since it is larger than the sum of its proper divisors (16270215).

18772065 is a wasteful number, since it uses less digits than its factorization.

18772065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32113 (or 32110 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 18772065 is about 4332.6741165243. The cubic root of 18772065 is about 265.7688128274.

The spelling of 18772065 in words is "eighteen million, seven hundred seventy-two thousand, sixty-five".