218923000 has 32 divisors (see below), whose sum is σ = 512282160. Its totient is φ = 87568800.

The previous prime is 218922989. The next prime is 218923007. The reversal of 218923000 is 329812.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218923007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108462 + ... + 110461.

Almost surely, 2^218923000 is an apocalyptic number.

218923000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218923000 is an abundant number, since it is smaller than the sum of its proper divisors (293359160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218923000 is a wasteful number, since it uses less digits than its factorization.

218923000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218944 (or 218930 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 218923000 is about 14796.0467693232. The cubic root of 218923000 is about 602.6943640411.

The spelling of 218923000 in words is "two hundred eighteen million, nine hundred twenty-three thousand".