18268340 has 12 divisors (see below), whose sum is σ = 38363556. Its totient is φ = 7307328.

The previous prime is 18268339. The next prime is 18268351. The reversal of 18268340 is 4386281.

It can be written as a sum of positive squares in 2 ways, for example, as 10837264 + 7431076 = 3292^2 + 2726^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18268297 and 18268306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456689 + ... + 456728.

It is an arithmetic number, because the mean of its divisors is an integer number (3196963).

Almost surely, 2^18268340 is an apocalyptic number.

18268340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18268340 is an abundant number, since it is smaller than the sum of its proper divisors (20095216).

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

18268340 is a wasteful number, since it uses less digits than its factorization.

18268340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913426 (or 913424 counting only the distinct ones).

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

The square root of 18268340 is about 4274.1478682891. The cubic root of 18268340 is about 263.3700352982.

The spelling of 18268340 in words is "eighteen million, two hundred sixty-eight thousand, three hundred forty".