2978659 has 4 divisors (see below), whose sum is σ = 2998800. Its totient is φ = 2958520.

The previous prime is 2978629. The next prime is 2978681. The reversal of 2978659 is 9568792.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2978659 - 2⁵ = 2978627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2978629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9847 + ... + 10144.

It is an arithmetic number, because the mean of its divisors is an integer number (749700).

2^2978659 is an apocalyptic number.

2978659 is a deficient number, since it is larger than the sum of its proper divisors (20141).

2978659 is a wasteful number, since it uses less digits than its factorization.

2978659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20140.

The product of its digits is 272160, while the sum is 46.

The square root of 2978659 is about 1725.8791962359. The cubic root of 2978659 is about 143.8821534546.

The spelling of 2978659 in words is "two million, nine hundred seventy-eight thousand, six hundred fifty-nine".