2091686 has 8 divisors (see below), whose sum is σ = 3151920. Its totient is φ = 1041048.

The previous prime is 2091671. The next prime is 2091703. The reversal of 2091686 is 6861902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent 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, 1826 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (393990).

2^2091686 is an apocalyptic number.

2091686 is a deficient number, since it is larger than the sum of its proper divisors (1060234).

2091686 is a wasteful number, since it uses less digits than its factorization.

2091686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4798.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2091686 is about 1446.2662272210. The cubic root of 2091686 is about 127.8886971896. Note that the first 3 decimals are identical.

The spelling of 2091686 in words is "two million, ninety-one thousand, six hundred eighty-six".