18040291 has 12 divisors (see below), whose sum is σ = 19684600. Its totient is φ = 16486848.

The previous prime is 18040277. The next prime is 18040327. The reversal of 18040291 is 19204081.

It is a happy number.

It is not a de Polignac number, because 18040291 - 2⁵ = 18040259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18040261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15415 + ... + 16543.

Almost surely, 2^18040291 is an apocalyptic number.

18040291 is a deficient number, since it is larger than the sum of its proper divisors (1644309).

18040291 is a wasteful number, since it uses less digits than its factorization.

18040291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18040291 is about 4247.3863728180. The cubic root of 18040291 is about 262.2695349835.

The spelling of 18040291 in words is "eighteen million, forty thousand, two hundred ninety-one".