18424404 has 36 divisors (see below), whose sum is σ = 46781280. Its totient is φ = 6114000.

The previous prime is 18424381. The next prime is 18424411. The reversal of 18424404 is 40442481.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8017 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (1299480).

Almost surely, 2^18424404 is an apocalyptic number.

It is an amenable number.

18424404 is an abundant number, since it is smaller than the sum of its proper divisors (28356876).

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

18424404 is a wasteful number, since it uses less digits than its factorization.

18424404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 18424404 is about 4292.3657812447. The cubic root of 18424404 is about 264.1178881211.

Adding to 18424404 its reverse (40442481), we get a palindrome (58866885).

The spelling of 18424404 in words is "eighteen million, four hundred twenty-four thousand, four hundred four".