1223857 has 2 divisors, whose sum is σ = 1223858. Its totient is φ = 1223856.

The previous prime is 1223777. The next prime is 1223863. The reversal of 1223857 is 7583221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218816 + 5041 = 1104^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223857 - 2¹⁵ = 1191089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611928 + 611929.

It is an arithmetic number, because the mean of its divisors is an integer number (611929).

2^1223857 is an apocalyptic number.

It is an amenable number.

1223857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223857 is an equidigital number, since it uses as much as digits as its factorization.

1223857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 1223857 is about 1106.2807057885. The cubic root of 1223857 is about 106.9654589065.

It can be divided in two parts, 1223 and 857, that added together give a triangular number (2080 = T₆₄).

The spelling of 1223857 in words is "one million, two hundred twenty-three thousand, eight hundred fifty-seven".