218450840 has 16 divisors (see below), whose sum is σ = 491514480. Its totient is φ = 87380320.

The previous prime is 218450801. The next prime is 218450851. The reversal of 218450840 is 48054812.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 218450797 and 218450806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2730596 + ... + 2730675.

It is an arithmetic number, because the mean of its divisors is an integer number (30719655).

Almost surely, 2^218450840 is an apocalyptic number.

218450840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218450840 is an abundant number, since it is smaller than the sum of its proper divisors (273063640).

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

218450840 is a wasteful number, since it uses less digits than its factorization.

218450840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461282 (or 5461278 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 218450840 is about 14780.0825437479. The cubic root of 218450840 is about 602.2607671504.

The spelling of 218450840 in words is "two hundred eighteen million, four hundred fifty thousand, eight hundred forty".