18440811 has 32 divisors (see below), whose sum is σ = 29120000. Its totient is φ = 11500704.

The previous prime is 18440791. The next prime is 18440813. The reversal of 18440811 is 11804481.

It is not a de Polignac number, because 18440811 - 2⁹ = 18440299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18440813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52665 + ... + 53013.

It is an arithmetic number, because the mean of its divisors is an integer number (910000).

Almost surely, 2^18440811 is an apocalyptic number.

18440811 is a deficient number, since it is larger than the sum of its proper divisors (10679189).

18440811 is a wasteful number, since it uses less digits than its factorization.

18440811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 18440811 is about 4294.2765397678. The cubic root of 18440811 is about 264.1962641801.

The spelling of 18440811 in words is "eighteen million, four hundred forty thousand, eight hundred eleven".