18430404 has 12 divisors (see below), whose sum is σ = 43004304. Its totient is φ = 6143464.

The previous prime is 18430351. The next prime is 18430409. The reversal of 18430404 is 40403481.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18430409) 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 3 ways as a sum of consecutive naturals, for example, 767922 + ... + 767945.

It is an arithmetic number, because the mean of its divisors is an integer number (3583692).

Almost surely, 2^18430404 is an apocalyptic number.

It is an amenable number.

18430404 is an abundant number, since it is smaller than the sum of its proper divisors (24573900).

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

18430404 is a wasteful number, since it uses less digits than its factorization.

18430404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535874 (or 1535872 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18430404 is about 4293.0646396252. The cubic root of 18430404 is about 264.1465554498.

Adding to 18430404 its reverse (40403481), we get a palindrome (58833885).

The spelling of 18430404 in words is "eighteen million, four hundred thirty thousand, four hundred four".