218493450 has 216 divisors, whose sum is σ = 710079552. Its totient is φ = 49805280.

The previous prime is 218493439. The next prime is 218493463. The reversal of 218493450 is 54394812.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 595167 + ... + 595533.

Almost surely, 2^218493450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218493450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355039776).

218493450 is an abundant number, since it is smaller than the sum of its proper divisors (491586102).

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

218493450 is a wasteful number, since it uses less digits than its factorization.

218493450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 218493450 is about 14781.5239403791. The cubic root of 218493450 is about 602.2999226616.

The spelling of 218493450 in words is "two hundred eighteen million, four hundred ninety-three thousand, four hundred fifty".