218197530 has 128 divisors (see below), whose sum is σ = 608256000. Its totient is φ = 55598400.

The previous prime is 218197519. The next prime is 218197541. The reversal of 218197530 is 35791812.

It is an interprime number because it is at equal distance from previous prime (218197519) and next prime (218197541).

It is a super-2 number, since 2×218197530² = 95220324196201800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1096371 + ... + 1096569.

It is an arithmetic number, because the mean of its divisors is an integer number (4752000).

Almost surely, 2^218197530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218197530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304128000).

218197530 is an abundant number, since it is smaller than the sum of its proper divisors (390058470).

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

218197530 is a wasteful number, since it uses less digits than its factorization.

218197530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 218197530 is about 14771.5107555050. The cubic root of 218197530 is about 602.0278883928.

The spelling of 218197530 in words is "two hundred eighteen million, one hundred ninety-seven thousand, five hundred thirty".