26420857 has 2 divisors, whose sum is σ = 26420858. Its totient is φ = 26420856.

The previous prime is 26420803. The next prime is 26420879. The reversal of 26420857 is 75802462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24098281 + 2322576 = 4909^2 + 1524^2 .

It is a cyclic number.

It is not a de Polignac number, because 26420857 - 2⁷ = 26420729 is a prime.

It is a super-2 number, since 2×26420857² = 1396123369228898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26420357) 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, 13210428 + 13210429.

It is an arithmetic number, because the mean of its divisors is an integer number (13210429).

Almost surely, 2^26420857 is an apocalyptic number.

It is an amenable number.

26420857 is a deficient number, since it is larger than the sum of its proper divisors (1).

26420857 is an equidigital number, since it uses as much as digits as its factorization.

26420857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 26420857 is about 5140.1222748102. The cubic root of 26420857 is about 297.8395041352.

The spelling of 26420857 in words is "twenty-six million, four hundred twenty thousand, eight hundred fifty-seven".