18424997 has 4 divisors (see below), whose sum is σ = 18684576. Its totient is φ = 18165420.

The previous prime is 18424969. The next prime is 18424999. The reversal of 18424997 is 79942481.

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 18424997 - 2⁸ = 18424741 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 (18424999) 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, 129683 + ... + 129824.

It is an arithmetic number, because the mean of its divisors is an integer number (4671144).

Almost surely, 2^18424997 is an apocalyptic number.

It is an amenable number.

18424997 is a deficient number, since it is larger than the sum of its proper divisors (259579).

18424997 is an equidigital number, since it uses as much as digits as its factorization.

18424997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259578.

The product of its digits is 145152, while the sum is 44.

The square root of 18424997 is about 4292.4348568150. The cubic root of 18424997 is about 264.1207216858.

The spelling of 18424997 in words is "eighteen million, four hundred twenty-four thousand, nine hundred ninety-seven".