2978709 has 4 divisors (see below), whose sum is σ = 3971616. Its totient is φ = 1985804.

The previous prime is 2978699. The next prime is 2978711. The reversal of 2978709 is 9078792.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2978709 - 2⁸ = 2978453 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978749) 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, 496449 + ... + 496454.

It is an arithmetic number, because the mean of its divisors is an integer number (992904).

2^2978709 is an apocalyptic number.

It is an amenable number.

2978709 is a deficient number, since it is larger than the sum of its proper divisors (992907).

2978709 is an equidigital number, since it uses as much as digits as its factorization.

2978709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992906.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 2978709 is about 1725.8936815459. The cubic root of 2978709 is about 143.8829585224.

The spelling of 2978709 in words is "two million, nine hundred seventy-eight thousand, seven hundred nine".