40218384 has 40 divisors (see below), whose sum is σ = 104864320. Its totient is φ = 13281408.

The previous prime is 40218359. The next prime is 40218391. The reversal of 40218384 is 48381204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389 + ... + 9075.

It is an arithmetic number, because the mean of its divisors is an integer number (2621608).

Almost surely, 2^40218384 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 40218384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52432160).

40218384 is an abundant number, since it is smaller than the sum of its proper divisors (64645936).

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

40218384 is a wasteful number, since it uses less digits than its factorization.

40218384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7807 (or 7801 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 40218384 is about 6341.7965908723. The cubic root of 40218384 is about 342.6164457447.

Adding to 40218384 its reverse (48381204), we get a palindrome (88599588).

Subtracting 40218384 from its reverse (48381204), we obtain a triangular number (8162820 = T₄₀₄₀).

The spelling of 40218384 in words is "forty million, two hundred eighteen thousand, three hundred eighty-four".