1230440257 has 2 divisors, whose sum is σ = 1230440258. Its totient is φ = 1230440256.

The previous prime is 1230440149. The next prime is 1230440303. The reversal of 1230440257 is 7520440321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1035809856 + 194630401 = 32184^2 + 13951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230440257 - 2²⁷ = 1096222529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1230440357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615220128 + 615220129.

It is an arithmetic number, because the mean of its divisors is an integer number (615220129).

Almost surely, 2^1230440257 is an apocalyptic number.

It is an amenable number.

1230440257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230440257 is an equidigital number, since it uses as much as digits as its factorization.

1230440257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 1230440257 is about 35077.6318613443. The cubic root of 1230440257 is about 1071.5690889998.

Adding to 1230440257 its reverse (7520440321), we get a palindrome (8750880578).

The spelling of 1230440257 in words is "one billion, two hundred thirty million, four hundred forty thousand, two hundred fifty-seven".