18431004 has 48 divisors (see below), whose sum is σ = 45948672. Its totient is φ = 5736192.

The previous prime is 18430943. The next prime is 18431011. The reversal of 18431004 is 40013481.

It is a congruent number.

It is an unprimeable number.

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, 11092 + ... + 12644.

It is an arithmetic number, because the mean of its divisors is an integer number (957264).

Almost surely, 2^18431004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18431004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22974336).

18431004 is an abundant number, since it is smaller than the sum of its proper divisors (27517668).

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

18431004 is a wasteful number, since it uses less digits than its factorization.

18431004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18431004 is about 4293.1345192062. The cubic root of 18431004 is about 264.1494218404.

Adding to 18431004 its reverse (40013481), we get a palindrome (58444485).

The spelling of 18431004 in words is "eighteen million, four hundred thirty-one thousand, four".