2691985 has 4 divisors (see below), whose sum is σ = 3230388. Its totient is φ = 2153584.

The previous prime is 2691979. The next prime is 2692003. The reversal of 2691985 is 5891962.

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

It can be written as a sum of positive squares in 2 ways, for example, as 712336 + 1979649 = 844^2 + 1407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2691985 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269194 + ... + 269203.

It is an arithmetic number, because the mean of its divisors is an integer number (807597).

2^2691985 is an apocalyptic number.

It is an amenable number.

2691985 is a deficient number, since it is larger than the sum of its proper divisors (538403).

2691985 is an equidigital number, since it uses as much as digits as its factorization.

2691985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538402.

The product of its digits is 38880, while the sum is 40.

The square root of 2691985 is about 1640.7269730214. The cubic root of 2691985 is about 139.1097420185.

The spelling of 2691985 in words is "two million, six hundred ninety-one thousand, nine hundred eighty-five".