18441997 has 8 divisors (see below), whose sum is σ = 21344000. Its totient is φ = 15606864.

The previous prime is 18441971. The next prime is 18442013. The reversal of 18441997 is 79914481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18441997 - 2¹⁹ = 17917709 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 (18441937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16122 + ... + 17227.

It is an arithmetic number, because the mean of its divisors is an integer number (2668000).

Almost surely, 2^18441997 is an apocalyptic number.

It is an amenable number.

18441997 is a deficient number, since it is larger than the sum of its proper divisors (2902003).

18441997 is an equidigital number, since it uses as much as digits as its factorization.

18441997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33435.

The product of its digits is 72576, while the sum is 43.

The square root of 18441997 is about 4294.4146283283. The cubic root of 18441997 is about 264.2019278871.

The spelling of 18441997 in words is "eighteen million, four hundred forty-one thousand, nine hundred ninety-seven".