2478891 has 8 divisors (see below), whose sum is σ = 3419280. Its totient is φ = 1595552.

The previous prime is 2478877. The next prime is 2478899. The reversal of 2478891 is 1988742.

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

It is a cyclic number.

It is not a de Polignac number, because 2478891 - 2²¹ = 381739 is a prime.

It is a super-2 number, since 2×2478891² = 12289801179762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2478899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14160 + ... + 14333.

It is an arithmetic number, because the mean of its divisors is an integer number (427410).

2^2478891 is an apocalyptic number.

2478891 is a deficient number, since it is larger than the sum of its proper divisors (940389).

2478891 is a wasteful number, since it uses less digits than its factorization.

2478891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28525.

The product of its digits is 32256, while the sum is 39.

The square root of 2478891 is about 1574.4494275778. The cubic root of 2478891 is about 135.3378096885.

The spelling of 2478891 in words is "two million, four hundred seventy-eight thousand, eight hundred ninety-one".