218140474 has 16 divisors (see below), whose sum is σ = 333849600. Its totient is φ = 106863120.

The previous prime is 218140457. The next prime is 218140477. The reversal of 218140474 is 474041812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (218140477) 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, 147559 + ... + 149029.

It is an arithmetic number, because the mean of its divisors is an integer number (20865600).

Almost surely, 2^218140474 is an apocalyptic number.

218140474 is a deficient number, since it is larger than the sum of its proper divisors (115709126).

218140474 is a wasteful number, since it uses less digits than its factorization.

218140474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 218140474 is about 14769.5793440436. The cubic root of 218140474 is about 601.9754094951.

The spelling of 218140474 in words is "two hundred eighteen million, one hundred forty thousand, four hundred seventy-four".