218807494 has 16 divisors (see below), whose sum is σ = 340355520. Its totient is φ = 105374080.

The previous prime is 218807431. The next prime is 218807497. The reversal of 218807494 is 494708812.

218807494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 218807494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218807497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20622 + ... + 29374.

It is an arithmetic number, because the mean of its divisors is an integer number (21272220).

Almost surely, 2^218807494 is an apocalyptic number.

218807494 is a deficient number, since it is larger than the sum of its proper divisors (121548026).

218807494 is a wasteful number, since it uses less digits than its factorization.

218807494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9215.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 218807494 is about 14792.1429820023. The cubic root of 218807494 is about 602.5883495033.

The spelling of 218807494 in words is "two hundred eighteen million, eight hundred seven thousand, four hundred ninety-four".