18964505 has 16 divisors (see below), whose sum is σ = 26615424. Its totient is φ = 12700800.

The previous prime is 18964487. The next prime is 18964507. The reversal of 18964505 is 50546981.

It is not a de Polignac number, because 18964505 - 2⁸ = 18964249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18964507) 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, 4796 + ... + 7805.

It is an arithmetic number, because the mean of its divisors is an integer number (1663464).

Almost surely, 2^18964505 is an apocalyptic number.

It is an amenable number.

18964505 is a deficient number, since it is larger than the sum of its proper divisors (7650919).

18964505 is a wasteful number, since it uses less digits than its factorization.

18964505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12656.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 18964505 is about 4354.8254844483. The cubic root of 18964505 is about 266.6738947694.

The spelling of 18964505 in words is "eighteen million, nine hundred sixty-four thousand, five hundred five".