18444811 has 8 divisors (see below), whose sum is σ = 22996224. Its totient is φ = 14372520.

The previous prime is 18444809. The next prime is 18444823. The reversal of 18444811 is 11844481.

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

It is a cyclic number.

It is not a de Polignac number, because 18444811 - 2¹ = 18444809 is a prime.

It is a super-2 number, since 2×18444811² = 680422105651442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18444851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119695 + ... + 119848.

It is an arithmetic number, because the mean of its divisors is an integer number (2874528).

Almost surely, 2^18444811 is an apocalyptic number.

18444811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18444811 is a deficient number, since it is larger than the sum of its proper divisors (4551413).

18444811 is a wasteful number, since it uses less digits than its factorization.

18444811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239561.

The product of its digits is 4096, while the sum is 31.

The square root of 18444811 is about 4294.7422507061. The cubic root of 18444811 is about 264.2153650873.

The spelling of 18444811 in words is "eighteen million, four hundred forty-four thousand, eight hundred eleven".