18909695 has 32 divisors (see below), whose sum is σ = 27962496. Its totient is φ = 11980800.

The previous prime is 18909691. The next prime is 18909697. The reversal of 18909695 is 59690981.

It is not a de Polignac number, because 18909695 - 2² = 18909691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36035 + ... + 36555.

It is an arithmetic number, because the mean of its divisors is an integer number (873828).

Almost surely, 2^18909695 is an apocalyptic number.

18909695 is a deficient number, since it is larger than the sum of its proper divisors (9052801).

18909695 is a wasteful number, since it uses less digits than its factorization.

18909695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 18909695 is about 4348.5279118341. The cubic root of 18909695 is about 266.4167389239.

The spelling of 18909695 in words is "eighteen million, nine hundred nine thousand, six hundred ninety-five".