2639858 has 8 divisors (see below), whose sum is σ = 4264428. Its totient is φ = 1218384.

The previous prime is 2639827. The next prime is 2639863. The reversal of 2639858 is 8589362.

2639858 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 2 ways, for example, as 2181529 + 458329 = 1477^2 + 677^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 50741 + ... + 50792.

2^2639858 is an apocalyptic number.

2639858 is a deficient number, since it is larger than the sum of its proper divisors (1624570).

2639858 is a wasteful number, since it uses less digits than its factorization.

2639858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101548.

The product of its digits is 103680, while the sum is 41.

The square root of 2639858 is about 1624.7639828603. The cubic root of 2639858 is about 138.2059865757.

The spelling of 2639858 in words is "two million, six hundred thirty-nine thousand, eight hundred fifty-eight".