18655965 has 12 divisors (see below), whose sum is σ = 32337084. Its totient is φ = 9949824.

The previous prime is 18655951. The next prime is 18655969. The reversal of 18655965 is 56955681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5846724 + 12809241 = 2418^2 + 3579^2 .

It is not a de Polignac number, because 18655965 - 2⁷ = 18655837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 414577 = 18655965 / (1 + 8 + 6 + 5 + 5 + 9 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 18655965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18655969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207244 + ... + 207333.

It is an arithmetic number, because the mean of its divisors is an integer number (2694757).

Almost surely, 2^18655965 is an apocalyptic number.

18655965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18655965 is a deficient number, since it is larger than the sum of its proper divisors (13681119).

18655965 is a wasteful number, since it uses less digits than its factorization.

18655965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414588 (or 414585 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 18655965 is about 4319.2551441192. The cubic root of 18655965 is about 265.2197773311.

It can be divided in two parts, 186559 and 65, that added together give a square (186624 = 432²).

The spelling of 18655965 in words is "eighteen million, six hundred fifty-five thousand, nine hundred sixty-five".