2861309 has 8 divisors (see below), whose sum is σ = 3133728. Its totient is φ = 2590960.

The previous prime is 2861303. The next prime is 2861317. The reversal of 2861309 is 9031682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2861309 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 (2861303) 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, 4859 + ... + 5415.

It is an arithmetic number, because the mean of its divisors is an integer number (391716).

2^2861309 is an apocalyptic number.

It is an amenable number.

2861309 is a deficient number, since it is larger than the sum of its proper divisors (272419).

2861309 is a wasteful number, since it uses less digits than its factorization.

2861309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2861309 is about 1691.5404222188. The cubic root of 2861309 is about 141.9672773902.

The spelling of 2861309 in words is "two million, eight hundred sixty-one thousand, three hundred nine".