2861858 has 12 divisors (see below), whose sum is σ = 4438710. Its totient is φ = 1383840.

The previous prime is 2861851. The next prime is 2861861. The reversal of 2861858 is 8581682.

2861858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2699449 + 162409 = 1643^2 + 403^2 .

It is not an unprimeable number, because it can be changed into a prime (2861851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178 + ... + 2666.

2^2861858 is an apocalyptic number.

2861858 is a deficient number, since it is larger than the sum of its proper divisors (1576852).

2861858 is a wasteful number, since it uses less digits than its factorization.

2861858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553 (or 1522 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The square root of 2861858 is about 1691.7026925556. The cubic root of 2861858 is about 141.9763565740.

The spelling of 2861858 in words is "two million, eight hundred sixty-one thousand, eight hundred fifty-eight".