2861643 has 4 divisors (see below), whose sum is σ = 3815528. Its totient is φ = 1907760.

The previous prime is 2861623. The next prime is 2861657. The reversal of 2861643 is 3461682.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2861643 - 2⁸ = 2861387 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2861643.

It is not an unprimeable number, because it can be changed into a prime (2861603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476938 + ... + 476943.

It is an arithmetic number, because the mean of its divisors is an integer number (953882).

2^2861643 is an apocalyptic number.

2861643 is a deficient number, since it is larger than the sum of its proper divisors (953885).

2861643 is an equidigital number, since it uses as much as digits as its factorization.

2861643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953884.

The product of its digits is 6912, while the sum is 30.

The square root of 2861643 is about 1691.6391459174. The cubic root of 2861643 is about 141.9728011121.

The spelling of 2861643 in words is "two million, eight hundred sixty-one thousand, six hundred forty-three".