18404897 has 16 divisors (see below), whose sum is σ = 22407552. Its totient is φ = 14757120.

The previous prime is 18404891. The next prime is 18404921. The reversal of 18404897 is 79840481.

It is a happy number.

It is not a de Polignac number, because 18404897 - 2¹² = 18400801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18404891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24743 + ... + 25475.

It is an arithmetic number, because the mean of its divisors is an integer number (1400472).

Almost surely, 2^18404897 is an apocalyptic number.

18404897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18404897 is a deficient number, since it is larger than the sum of its proper divisors (4002655).

18404897 is a wasteful number, since it uses less digits than its factorization.

18404897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 18404897 is about 4290.0928894372. The cubic root of 18404897 is about 264.0246428252.

The spelling of 18404897 in words is "eighteen million, four hundred four thousand, eight hundred ninety-seven".