18240859 has 16 divisors (see below), whose sum is σ = 23002560. Its totient is φ = 14077440.

The previous prime is 18240857. The next prime is 18240869. The reversal of 18240859 is 95804281.

It is not a de Polignac number, because 18240859 - 2¹ = 18240857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18240857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287 + ... + 6175.

It is an arithmetic number, because the mean of its divisors is an integer number (1437660).

Almost surely, 2^18240859 is an apocalyptic number.

18240859 is a deficient number, since it is larger than the sum of its proper divisors (4761701).

18240859 is a wasteful number, since it uses less digits than its factorization.

18240859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 18240859 is about 4270.9318655301. The cubic root of 18240859 is about 263.2379068148.

It can be divided in two parts, 182 and 40859, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 18240859 in words is "eighteen million, two hundred forty thousand, eight hundred fifty-nine".