18509963 has 8 divisors (see below), whose sum is σ = 19726848. Its totient is φ = 17327464.

The previous prime is 18509941. The next prime is 18509977. The reversal of 18509963 is 36990581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18509963 - 2⁶ = 18509899 is a prime.

It is a super-2 number, since 2×18509963² = 685237460522738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18509963.

It is not an unprimeable number, because it can be changed into a prime (18509903) 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 7 ways as a sum of consecutive naturals, for example, 7481 + ... + 9642.

It is an arithmetic number, because the mean of its divisors is an integer number (2465856).

Almost surely, 2^18509963 is an apocalyptic number.

18509963 is a deficient number, since it is larger than the sum of its proper divisors (1216885).

18509963 is a wasteful number, since it uses less digits than its factorization.

18509963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17193.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 18509963 is about 4302.3206528570. The cubic root of 18509963 is about 264.5260926014.

The spelling of 18509963 in words is "eighteen million, five hundred nine thousand, nine hundred sixty-three".