2555978 has 8 divisors (see below), whose sum is σ = 3906468. Its totient is φ = 1253824.

The previous prime is 2555957. The next prime is 2555989. The reversal of 2555978 is 8795552.

It can be written as a sum of positive squares in 2 ways, for example, as 2455489 + 100489 = 1567^2 + 317^2 .

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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11951 + ... + 12162.

2^2555978 is an apocalyptic number.

2555978 is a deficient number, since it is larger than the sum of its proper divisors (1350490).

2555978 is a wasteful number, since it uses less digits than its factorization.

2555978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24168.

The product of its digits is 126000, while the sum is 41.

The square root of 2555978 is about 1598.7426309447. The cubic root of 2555978 is about 136.7263973159.

The spelling of 2555978 in words is "two million, five hundred fifty-five thousand, nine hundred seventy-eight".