223997857 has 2 divisors, whose sum is σ = 223997858. Its totient is φ = 223997856.

The previous prime is 223997849. The next prime is 223997861. The reversal of 223997857 is 758799322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178516321 + 45481536 = 13361^2 + 6744^2 .

It is a cyclic number.

It is not a de Polignac number, because 223997857 - 2³ = 223997849 is a prime.

It is not a weakly prime, because it can be changed into another prime (223997867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111998928 + 111998929.

It is an arithmetic number, because the mean of its divisors is an integer number (111998929).

Almost surely, 2^223997857 is an apocalyptic number.

It is an amenable number.

223997857 is a deficient number, since it is larger than the sum of its proper divisors (1).

223997857 is an equidigital number, since it uses as much as digits as its factorization.

223997857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 52.

The square root of 223997857 is about 14966.5579543194. The cubic root of 223997857 is about 607.3158576397.

The spelling of 223997857 in words is "two hundred twenty-three million, nine hundred ninety-seven thousand, eight hundred fifty-seven".