18163797 has 4 divisors (see below), whose sum is σ = 24218400. Its totient is φ = 12109196.

The previous prime is 18163793. The next prime is 18163807. The reversal of 18163797 is 79736181.

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.

It is a cyclic number.

It is not a de Polignac number, because 18163797 - 2² = 18163793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163793) 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, 3027297 + ... + 3027302.

It is an arithmetic number, because the mean of its divisors is an integer number (6054600).

Almost surely, 2^18163797 is an apocalyptic number.

It is an amenable number.

18163797 is a deficient number, since it is larger than the sum of its proper divisors (6054603).

18163797 is an equidigital number, since it uses as much as digits as its factorization.

18163797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6054602.

The product of its digits is 63504, while the sum is 42.

The square root of 18163797 is about 4261.9006323470. The cubic root of 18163797 is about 262.8666839159.

The spelling of 18163797 in words is "eighteen million, one hundred sixty-three thousand, seven hundred ninety-seven".