2861391 has 8 divisors (see below), whose sum is σ = 4108720. Its totient is φ = 1760832.

The previous prime is 2861387. The next prime is 2861399. The reversal of 2861391 is 1931682.

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

It is not a de Polignac number, because 2861391 - 2² = 2861387 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 (2861399) 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 7 ways as a sum of consecutive naturals, for example, 36646 + ... + 36723.

It is an arithmetic number, because the mean of its divisors is an integer number (513590).

2^2861391 is an apocalyptic number.

2861391 is a deficient number, since it is larger than the sum of its proper divisors (1247329).

2861391 is a wasteful number, since it uses less digits than its factorization.

2861391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73385.

The product of its digits is 2592, while the sum is 30.

The square root of 2861391 is about 1691.5646603071. The cubic root of 2861391 is about 141.9686335533.

The spelling of 2861391 in words is "two million, eight hundred sixty-one thousand, three hundred ninety-one".