2865391 has 8 divisors (see below), whose sum is σ = 3012944. Its totient is φ = 2721600.

The previous prime is 2865383. The next prime is 2865397. The reversal of 2865391 is 1935682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2865391 - 2³ = 2865383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2865397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691 + ... + 2491.

It is an arithmetic number, because the mean of its divisors is an integer number (376618).

2^2865391 is an apocalyptic number.

2865391 is a deficient number, since it is larger than the sum of its proper divisors (147553).

2865391 is a wasteful number, since it uses less digits than its factorization.

2865391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881.

The product of its digits is 12960, while the sum is 34.

The square root of 2865391 is about 1692.7465846960. The cubic root of 2865391 is about 142.0347564198.

The spelling of 2865391 in words is "two million, eight hundred sixty-five thousand, three hundred ninety-one".