18664965 has 32 divisors (see below), whose sum is σ = 36201600. Its totient is φ = 9048960.

The previous prime is 18664949. The next prime is 18664981. The reversal of 18664965 is 56946681.

It is an interprime number because it is at equal distance from previous prime (18664949) and next prime (18664981).

It is not a de Polignac number, because 18664965 - 2⁴ = 18664949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18664965.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4800 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (1131300).

Almost surely, 2^18664965 is an apocalyptic number.

18664965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18664965 is a deficient number, since it is larger than the sum of its proper divisors (17536635).

18664965 is a wasteful number, since it uses less digits than its factorization.

18664965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12594 (or 12588 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 18664965 is about 4320.2968647999. The cubic root of 18664965 is about 265.2624195326.

The spelling of 18664965 in words is "eighteen million, six hundred sixty-four thousand, nine hundred sixty-five".