2856397 has 2 divisors, whose sum is σ = 2856398. Its totient is φ = 2856396.

The previous prime is 2856379. The next prime is 2856409. The reversal of 2856397 is 7936582.

Together with previous prime (2856379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2643876 + 212521 = 1626^2 + 461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2856397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2856377) 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, 1428198 + 1428199.

It is an arithmetic number, because the mean of its divisors is an integer number (1428199).

2^2856397 is an apocalyptic number.

It is an amenable number.

2856397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2856397 is an equidigital number, since it uses as much as digits as its factorization.

2856397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 2856397 is about 1690.0878675383. The cubic root of 2856397 is about 141.8859926018.

The spelling of 2856397 in words is "two million, eight hundred fifty-six thousand, three hundred ninety-seven".