2056709 has 4 divisors (see below), whose sum is σ = 2127660. Its totient is φ = 1985760.

The previous prime is 2056697. The next prime is 2056727. The reversal of 2056709 is 9076502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9076502 = 2 ⋅4538251.

It can be written as a sum of positive squares in 2 ways, for example, as 1562500 + 494209 = 1250^2 + 703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2056709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 70921 = 2056709 / (2 + 0 + 5 + 6 + 7 + 0 + 9).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35432 + ... + 35489.

It is an arithmetic number, because the mean of its divisors is an integer number (531915).

2^2056709 is an apocalyptic number.

2056709 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2056709 is a deficient number, since it is larger than the sum of its proper divisors (70951).

2056709 is an equidigital number, since it uses as much as digits as its factorization.

2056709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70950.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 2056709 is about 1434.1230770056. The cubic root of 2056709 is about 127.1718383986.

The spelling of 2056709 in words is "two million, fifty-six thousand, seven hundred nine".