18240697 has 4 divisors (see below), whose sum is σ = 18256000. Its totient is φ = 18225396.

The previous prime is 18240689. The next prime is 18240707. The reversal of 18240697 is 79604281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79604281 = 19 ⋅4189699.

It is a cyclic number.

It is not a de Polignac number, because 18240697 - 2³ = 18240689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18240097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5697 + ... + 8302.

It is an arithmetic number, because the mean of its divisors is an integer number (4564000).

Almost surely, 2^18240697 is an apocalyptic number.

It is an amenable number.

18240697 is a deficient number, since it is larger than the sum of its proper divisors (15303).

18240697 is a wasteful number, since it uses less digits than its factorization.

18240697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15302.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 18240697 is about 4270.9129000718. The cubic root of 18240697 is about 263.2371275264.

The spelling of 18240697 in words is "eighteen million, two hundred forty thousand, six hundred ninety-seven".