223297640 has 32 divisors (see below), whose sum is σ = 503685000. Its totient is φ = 89094144.

The previous prime is 223297631. The next prime is 223297663. The reversal of 223297640 is 46792322.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 181333156 + 41964484 = 13466^2 + 6478^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 223297640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9536 + ... + 23184.

Almost surely, 2^223297640 is an apocalyptic number.

223297640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223297640 is an abundant number, since it is smaller than the sum of its proper divisors (280387360).

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

223297640 is a wasteful number, since it uses less digits than its factorization.

223297640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14069 (or 14065 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 223297640 is about 14943.1469242593. The cubic root of 223297640 is about 606.6823742394.

The spelling of 223297640 in words is "two hundred twenty-three million, two hundred ninety-seven thousand, six hundred forty".