2686421 has 4 divisors (see below), whose sum is σ = 2697132. Its totient is φ = 2675712.

The previous prime is 2686393. The next prime is 2686451. The reversal of 2686421 is 1246862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1246862 = 2 ⋅623431.

It can be written as a sum of positive squares in 2 ways, for example, as 2640625 + 45796 = 1625^2 + 214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2686421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686451) 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, 4970 + ... + 5483.

It is an arithmetic number, because the mean of its divisors is an integer number (674283).

2^2686421 is an apocalyptic number.

It is an amenable number.

2686421 is a deficient number, since it is larger than the sum of its proper divisors (10711).

2686421 is a wasteful number, since it uses less digits than its factorization.

2686421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10710.

The product of its digits is 4608, while the sum is 29.

The square root of 2686421 is about 1639.0305061224. The cubic root of 2686421 is about 139.0138350358.

The spelling of 2686421 in words is "two million, six hundred eighty-six thousand, four hundred twenty-one".