18249897 has 4 divisors (see below), whose sum is σ = 24333200. Its totient is φ = 12166596.

The previous prime is 18249877. The next prime is 18249923. The reversal of 18249897 is 79894281.

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 not a de Polignac number, because 18249897 - 2¹⁴ = 18233513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18249817) 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, 3041647 + ... + 3041652.

It is an arithmetic number, because the mean of its divisors is an integer number (6083300).

Almost surely, 2^18249897 is an apocalyptic number.

It is an amenable number.

18249897 is a deficient number, since it is larger than the sum of its proper divisors (6083303).

18249897 is an equidigital number, since it uses as much as digits as its factorization.

18249897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083302.

The product of its digits is 290304, while the sum is 48.

The square root of 18249897 is about 4271.9898174036. The cubic root of 18249897 is about 263.2813761011.

The spelling of 18249897 in words is "eighteen million, two hundred forty-nine thousand, eight hundred ninety-seven".