18263840 has 96 divisors (see below), whose sum is σ = 51528960. Its totient is φ = 5981184.

The previous prime is 18263837. The next prime is 18263849. The reversal of 18263840 is 4836281.

18263840 = T₁₅₅₃ + T₁₅₅₄ + ... + T₁₅₆₇.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 18263797 and 18263806.

It is not an unprimeable number, because it can be changed into a prime (18263849) 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 15 ways as a sum of consecutive naturals, for example, 25406 + ... + 26114.

It is an arithmetic number, because the mean of its divisors is an integer number (536760).

Almost surely, 2^18263840 is an apocalyptic number.

18263840 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 18263840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25764480).

18263840 is an abundant number, since it is smaller than the sum of its proper divisors (33265120).

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

18263840 is a wasteful number, since it uses less digits than its factorization.

18263840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 746 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 18263840 is about 4273.6214151466. The cubic root of 18263840 is about 263.3484084019.

The spelling of 18263840 in words is "eighteen million, two hundred sixty-three thousand, eight hundred forty".