2091387 has 8 divisors (see below), whose sum is σ = 2935360. Its totient is φ = 1320840.

The previous prime is 2091379. The next prime is 2091389. The reversal of 2091387 is 7831902.

It is a happy number.

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

It is not a de Polignac number, because 2091387 - 2³ = 2091379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18289 + ... + 18402.

It is an arithmetic number, because the mean of its divisors is an integer number (366920).

2^2091387 is an apocalyptic number.

2091387 is a deficient number, since it is larger than the sum of its proper divisors (843973).

2091387 is a wasteful number, since it uses less digits than its factorization.

2091387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36713.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2091387 is about 1446.1628538999. The cubic root of 2091387 is about 127.8826031356.

It can be divided in two parts, 209 and 1387, that added together give a triangular number (1596 = T₅₆).

The spelling of 2091387 in words is "two million, ninety-one thousand, three hundred eighty-seven".