2915861 has 8 divisors (see below), whose sum is σ = 3192504. Its totient is φ = 2646720.

The previous prime is 2915849. The next prime is 2915893. The reversal of 2915861 is 1685192.

It can be written as a sum of positive squares in 4 ways, for example, as 8836 + 2907025 = 94^2 + 1705^2 .

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-2915861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2915831) 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, 1046 + ... + 2631.

It is an arithmetic number, because the mean of its divisors is an integer number (399063).

2^2915861 is an apocalyptic number.

It is an amenable number.

2915861 is a deficient number, since it is larger than the sum of its proper divisors (276643).

2915861 is a wasteful number, since it uses less digits than its factorization.

2915861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751.

The product of its digits is 4320, while the sum is 32.

The square root of 2915861 is about 1707.5892363212. The cubic root of 2915861 is about 142.8638245922.

The spelling of 2915861 in words is "two million, nine hundred fifteen thousand, eight hundred sixty-one".