218863457 has 12 divisors (see below), whose sum is σ = 233326140. Its totient is φ = 205253376.

The previous prime is 218863439. The next prime is 218863501. The reversal of 218863457 is 754368812.

218863457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 3243601 + 215619856 = 1801^2 + 14684^2 .

It is not a de Polignac number, because 218863457 - 2⁸ = 218863201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218865457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90419 + ... + 92807.

It is an arithmetic number, because the mean of its divisors is an integer number (19443845).

Almost surely, 2^218863457 is an apocalyptic number.

It is an amenable number.

218863457 is a deficient number, since it is larger than the sum of its proper divisors (14462683).

218863457 is a wasteful number, since it uses less digits than its factorization.

218863457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740 (or 2723 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 218863457 is about 14794.0345071924. The cubic root of 218863457 is about 602.6397185196.

The spelling of 218863457 in words is "two hundred eighteen million, eight hundred sixty-three thousand, four hundred fifty-seven".