18440499 has 16 divisors (see below), whose sum is σ = 30654720. Its totient is φ = 9579360.

The previous prime is 18440489. The next prime is 18440501. The reversal of 18440499 is 99404481.

It is not a de Polignac number, because 18440499 - 2¹³ = 18432307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18440419) 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 15 ways as a sum of consecutive naturals, for example, 39684 + ... + 40145.

It is an arithmetic number, because the mean of its divisors is an integer number (1915920).

Almost surely, 2^18440499 is an apocalyptic number.

18440499 is a deficient number, since it is larger than the sum of its proper divisors (12214221).

18440499 is a wasteful number, since it uses less digits than its factorization.

18440499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79850.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18440499 is about 4294.2402121912. The cubic root of 18440499 is about 264.1947741932.

The spelling of 18440499 in words is "eighteen million, four hundred forty thousand, four hundred ninety-nine".