18424836 has 18 divisors (see below), whose sum is σ = 46573982. Its totient is φ = 6141600.

The previous prime is 18424829. The next prime is 18424841. The reversal of 18424836 is 63842481.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 20736 = 4290^2 + 144^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 511801 = 18424836 / (1 + 8 + 4 + 2 + 4 + 8 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 18424836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255865 + ... + 255936.

Almost surely, 2^18424836 is an apocalyptic number.

It is an amenable number.

18424836 is an abundant number, since it is smaller than the sum of its proper divisors (28149146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18424836 is a wasteful number, since it uses less digits than its factorization.

18424836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511811 (or 511806 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 18424836 is about 4292.4161028493. The cubic root of 18424836 is about 264.1199523766.

The spelling of 18424836 in words is "eighteen million, four hundred twenty-four thousand, eight hundred thirty-six".