2806397 has 4 divisors (see below), whose sum is σ = 3061536. Its totient is φ = 2551260.

The previous prime is 2806387. The next prime is 2806439. The reversal of 2806397 is 7936082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2806397 - 2⁴ = 2806381 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 8⁷ + 0 + 6⁶ + 3³ + 9⁶ + 7² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2806367) 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 in 3 ways as a sum of consecutive naturals, for example, 127553 + ... + 127574.

It is an arithmetic number, because the mean of its divisors is an integer number (765384).

2^2806397 is an apocalyptic number.

It is an amenable number.

2806397 is a deficient number, since it is larger than the sum of its proper divisors (255139).

2806397 is a wasteful number, since it uses less digits than its factorization.

2806397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255138.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 2806397 is about 1675.2304319108. The cubic root of 2806397 is about 141.0532300740.

The spelling of 2806397 in words is "two million, eight hundred six thousand, three hundred ninety-seven".