2685739 has 12 divisors (see below), whose sum is σ = 3180600. Its totient is φ = 2260608.

The previous prime is 2685731. The next prime is 2685757. The reversal of 2685739 is 9375862.

It is not a de Polignac number, because 2685739 - 2³ = 2685731 is a prime.

It is a super-2 number, since 2×2685739² = 14426387952242, which contains 22 as substring.

It is a Duffinian number.

2685739 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2685731) 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 11 ways as a sum of consecutive naturals, for example, 2427 + ... + 3355.

It is an arithmetic number, because the mean of its divisors is an integer number (265050).

2^2685739 is an apocalyptic number.

2685739 is a deficient number, since it is larger than the sum of its proper divisors (494861).

2685739 is an equidigital number, since it uses as much as digits as its factorization.

2685739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 995 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 2685739 is about 1638.8224430975. The cubic root of 2685739 is about 139.0020702554.

It can be divided in two parts, 26857 and 39, that added together give a square (26896 = 164²).

The spelling of 2685739 in words is "two million, six hundred eighty-five thousand, seven hundred thirty-nine".