2861878 has 4 divisors (see below), whose sum is σ = 4292820. Its totient is φ = 1430938.

The previous prime is 2861869. The next prime is 2861897. The reversal of 2861878 is 8781682.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2861878.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 715468 + ... + 715471.

It is an arithmetic number, because the mean of its divisors is an integer number (1073205).

2^2861878 is an apocalyptic number.

2861878 is a deficient number, since it is larger than the sum of its proper divisors (1430942).

2861878 is a wasteful number, since it uses less digits than its factorization.

2861878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430941.

The product of its digits is 43008, while the sum is 40.

The square root of 2861878 is about 1691.7086037495. The cubic root of 2861878 is about 141.9766873056.

The spelling of 2861878 in words is "two million, eight hundred sixty-one thousand, eight hundred seventy-eight".