223218740 has 12 divisors (see below), whose sum is σ = 468759396. Its totient is φ = 89287488.

The previous prime is 223218739. The next prime is 223218757. The reversal of 223218740 is 47812322.

223218740 = T₅₄₄₈ + T₅₄₄₉ + ... + T₅₄₆₂.

It can be written as a sum of positive squares in 2 ways, for example, as 168636196 + 54582544 = 12986^2 + 7388^2 .

It is a super-3 number, since 3×223218740³ (a number of 26 digits) contains 333 as substring.

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, 5580449 + ... + 5580488.

It is an arithmetic number, because the mean of its divisors is an integer number (39063283).

Almost surely, 2^223218740 is an apocalyptic number.

223218740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223218740 is an abundant number, since it is smaller than the sum of its proper divisors (245540656).

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

223218740 is a wasteful number, since it uses less digits than its factorization.

223218740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160946 (or 11160944 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 223218740 is about 14940.5066848484. The cubic root of 223218740 is about 606.6109107610.

The spelling of 223218740 in words is "two hundred twenty-three million, two hundred eighteen thousand, seven hundred forty".