18933404 has 36 divisors (see below), whose sum is σ = 39884040. Its totient is φ = 7832160.

The previous prime is 18933403. The next prime is 18933407. The reversal of 18933404 is 40433981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18933403) 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 11 ways as a sum of consecutive naturals, for example, 4019 + ... + 7349.

It is an arithmetic number, because the mean of its divisors is an integer number (1107890).

Almost surely, 2^18933404 is an apocalyptic number.

18933404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18933404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19942020).

18933404 is an abundant number, since it is smaller than the sum of its proper divisors (20950636).

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

18933404 is a wasteful number, since it uses less digits than its factorization.

18933404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378 (or 3369 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 18933404 is about 4351.2531528285. The cubic root of 18933404 is about 266.5280369720.

The spelling of 18933404 in words is "eighteen million, nine hundred thirty-three thousand, four hundred four".