2478681 has 20 divisors (see below), whose sum is σ = 3763584. Its totient is φ = 1625400.

The previous prime is 2478677. The next prime is 2478691. The reversal of 2478681 is 1868742.

2478681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2478681 - 2² = 2478677 is a prime.

It is a super-2 number, since 2×2478681² = 12287718999522, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478611) 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 19 ways as a sum of consecutive naturals, for example, 5536 + ... + 5966.

2^2478681 is an apocalyptic number.

It is an amenable number.

2478681 is a deficient number, since it is larger than the sum of its proper divisors (1284903).

2478681 is an equidigital number, since it uses as much as digits as its factorization.

2478681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 505 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 2478681 is about 1574.3827361858. The cubic root of 2478681 is about 135.3339878528. Note that the first 3 decimals are identical.

The spelling of 2478681 in words is "two million, four hundred seventy-eight thousand, six hundred eighty-one".