223243857 has 28 divisors (see below), whose sum is σ = 336018804. Its totient is φ = 148249440.

The previous prime is 223243849. The next prime is 223243859. The reversal of 223243857 is 758342322.

It can be written as a sum of positive squares in 2 ways, for example, as 90326016 + 132917841 = 9504^2 + 11529^2 .

It is not a de Polignac number, because 223243857 - 2³ = 223243849 is a prime.

It is a super-5 number, since 5×223243857⁵ (a number of 43 digits) contains 55555 as substring. Note that it is a super-d number also for d = 3.

It is not an unprimeable number, because it can be changed into a prime (223243859) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 271507 + ... + 272327.

Almost surely, 2^223243857 is an apocalyptic number.

223243857 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

223243857 is a deficient number, since it is larger than the sum of its proper divisors (112774947).

223243857 is an frugal number, since it uses more digits than its factorization.

223243857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212 (or 1197 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 223243857 is about 14941.3472284128. The cubic root of 223243857 is about 606.6336622480.

The spelling of 223243857 in words is "two hundred twenty-three million, two hundred forty-three thousand, eight hundred fifty-seven".