2978857 has 6 divisors (see below), whose sum is σ = 3465258. Its totient is φ = 2553264.

The previous prime is 2978819. The next prime is 2978869. The reversal of 2978857 is 7588792.

2978857 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 only one way, i.e., 2752281 + 226576 = 1659^2 + 476^2 .

It is not a de Polignac number, because 2978857 - 2¹⁵ = 2946089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2978357) 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 5 ways as a sum of consecutive naturals, for example, 30348 + ... + 30445.

It is an arithmetic number, because the mean of its divisors is an integer number (577543).

2^2978857 is an apocalyptic number.

It is an amenable number.

2978857 is a deficient number, since it is larger than the sum of its proper divisors (486401).

2978857 is an equidigital number, since it uses as much as digits as its factorization.

2978857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60807 (or 60800 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The square root of 2978857 is about 1725.9365573508. The cubic root of 2978857 is about 143.8853414703.

The spelling of 2978857 in words is "two million, nine hundred seventy-eight thousand, eight hundred fifty-seven".