2685391 has 4 divisors (see below), whose sum is σ = 2688984. Its totient is φ = 2681800.

The previous prime is 2685383. The next prime is 2685401. The reversal of 2685391 is 1935862.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1935862 = 2 ⋅967931.

It is a cyclic number.

It is not a de Polignac number, because 2685391 - 2³ = 2685383 is a prime.

It is a super-2 number, since 2×2685391² = 14422649645762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685301) 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, 205 + ... + 2326.

It is an arithmetic number, because the mean of its divisors is an integer number (672246).

2^2685391 is an apocalyptic number.

2685391 is a deficient number, since it is larger than the sum of its proper divisors (3593).

2685391 is a wasteful number, since it uses less digits than its factorization.

2685391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592.

The product of its digits is 12960, while the sum is 34.

The square root of 2685391 is about 1638.7162658618. The cubic root of 2685391 is about 138.9960663449.

The spelling of 2685391 in words is "two million, six hundred eighty-five thousand, three hundred ninety-one".