260405857 has 2 divisors, whose sum is σ = 260405858. Its totient is φ = 260405856.

The previous prime is 260405851. The next prime is 260405863. The reversal of 260405857 is 758504062.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (260405851) and next prime (260405863).

It can be written as a sum of positive squares in only one way, i.e., 259822161 + 583696 = 16119^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 260405857 - 2¹¹ = 260403809 is a prime.

It is a super-2 number, since 2×260405857² = 135622420719808898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (260405851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130202928 + 130202929.

It is an arithmetic number, because the mean of its divisors is an integer number (130202929).

Almost surely, 2^260405857 is an apocalyptic number.

It is an amenable number.

260405857 is a deficient number, since it is larger than the sum of its proper divisors (1).

260405857 is an equidigital number, since it uses as much as digits as its factorization.

260405857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 260405857 is about 16137.0956804501. The cubic root of 260405857 is about 638.5823577529.

The spelling of 260405857 in words is "two hundred sixty million, four hundred five thousand, eight hundred fifty-seven".