2556842 has 8 divisors (see below), whose sum is σ = 3928932. Its totient is φ = 1247200.

The previous prime is 2556839. The next prime is 2556857. The reversal of 2556842 is 2486552.

It can be written as a sum of positive squares in 2 ways, for example, as 1745041 + 811801 = 1321^2 + 901^2 .

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

It is a d-powerful number, because it can be written as 2¹⁷ + 5⁷ + 5⁹ + 6⁴ + 8 + 4⁹ + 2¹⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 2556799 and 2556808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15509 + ... + 15672.

2^2556842 is an apocalyptic number.

2556842 is a deficient number, since it is larger than the sum of its proper divisors (1372090).

2556842 is a wasteful number, since it uses less digits than its factorization.

2556842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31224.

The product of its digits is 19200, while the sum is 32.

The square root of 2556842 is about 1599.0128204614. The cubic root of 2556842 is about 136.7418015042.

The spelling of 2556842 in words is "two million, five hundred fifty-six thousand, eight hundred forty-two".