18040464 has 120 divisors (see below), whose sum is σ = 56871360. Its totient is φ = 5296896.

The previous prime is 18040459. The next prime is 18040469. The reversal of 18040464 is 46404081.

It is an interprime number because it is at equal distance from previous prime (18040459) and next prime (18040469).

It is not an unprimeable number, because it can be changed into a prime (18040469) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42847 + ... + 43265.

It is an arithmetic number, because the mean of its divisors is an integer number (473928).

Almost surely, 2^18040464 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 18040464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28435680).

18040464 is an abundant number, since it is smaller than the sum of its proper divisors (38830896).

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

18040464 is a wasteful number, since it uses less digits than its factorization.

18040464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 18040464 is about 4247.4067382345. The cubic root of 18040464 is about 262.2703733381.

It can be divided in two parts, 1804046 and 4, that added together give a triangular number (1804050 = T₁₈₉₉).

The spelling of 18040464 in words is "eighteen million, forty thousand, four hundred sixty-four".