18240356 has 12 divisors (see below), whose sum is σ = 31983420. Its totient is φ = 9102240.

The previous prime is 18240353. The next prime is 18240359. The reversal of 18240356 is 65304281.

It is an interprime number because it is at equal distance from previous prime (18240353) and next prime (18240359).

It can be written as a sum of positive squares in 2 ways, for example, as 4990756 + 13249600 = 2234^2 + 3640^2 .

It is not an unprimeable number, because it can be changed into a prime (18240353) 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 3 ways as a sum of consecutive naturals, for example, 2051 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (2665285).

Almost surely, 2^18240356 is an apocalyptic number.

It is an amenable number.

18240356 is a deficient number, since it is larger than the sum of its proper divisors (13743064).

18240356 is a wasteful number, since it uses less digits than its factorization.

18240356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8974 (or 8972 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 18240356 is about 4270.8729786778. The cubic root of 18240356 is about 263.2354871574.

The spelling of 18240356 in words is "eighteen million, two hundred forty thousand, three hundred fifty-six".