18697091 has 8 divisors (see below), whose sum is σ = 22297344. Its totient is φ = 15329160.

The previous prime is 18697057. The next prime is 18697139. The reversal of 18697091 is 19079681.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-18697091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18697001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57905 + ... + 58226.

It is an arithmetic number, because the mean of its divisors is an integer number (2787168).

Almost surely, 2^18697091 is an apocalyptic number.

18697091 is a deficient number, since it is larger than the sum of its proper divisors (3600253).

18697091 is a wasteful number, since it uses less digits than its factorization.

18697091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116161.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 18697091 is about 4324.0132978519. The cubic root of 18697091 is about 265.4145215399.

The spelling of 18697091 in words is "eighteen million, six hundred ninety-seven thousand, ninety-one".