18241640 has 64 divisors (see below), whose sum is σ = 43407360. Its totient is φ = 6888960.

The previous prime is 18241637. The next prime is 18241669. The reversal of 18241640 is 4614281.

18241640 is nontrivially palindromic in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58124 + ... + 58436.

It is an arithmetic number, because the mean of its divisors is an integer number (678240).

Almost surely, 2^18241640 is an apocalyptic number.

18241640 is a gapful number since it is divisible by the number (10) 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 18241640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21703680).

18241640 is an abundant number, since it is smaller than the sum of its proper divisors (25165720).

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

18241640 is a wasteful number, since it uses less digits than its factorization.

18241640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18241640 is about 4271.0232965883. The cubic root of 18241640 is about 263.2416636896.

It can be divided in two parts, 18241 and 640, that added together give a palindrome (18881).

The spelling of 18241640 in words is "eighteen million, two hundred forty-one thousand, six hundred forty".