2978817 has 8 divisors (see below), whose sum is σ = 3980160. Its totient is φ = 1981680.

The previous prime is 2978797. The next prime is 2978819. The reversal of 2978817 is 7188792.

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

It is a de Polignac number, because none of the positive numbers 2^k-2978817 is a prime.

2978817 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2978819) 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, 1467 + ... + 2847.

It is an arithmetic number, because the mean of its divisors is an integer number (497520).

2^2978817 is an apocalyptic number.

It is an amenable number.

2978817 is a deficient number, since it is larger than the sum of its proper divisors (1001343).

2978817 is a wasteful number, since it uses less digits than its factorization.

2978817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103.

The product of its digits is 56448, while the sum is 42.

The square root of 2978817 is about 1725.9249694005. The cubic root of 2978817 is about 143.8846974381.

The spelling of 2978817 in words is "two million, nine hundred seventy-eight thousand, eight hundred seventeen".