2091807 has 12 divisors (see below), whose sum is σ = 3067480. Its totient is φ = 1373328.

The previous prime is 2091797. The next prime is 2091809. The reversal of 2091807 is 7081902.

It is not a de Polignac number, because 2091807 - 2¹² = 2087711 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 (2091809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1132 + ... + 2337.

2^2091807 is an apocalyptic number.

2091807 is a deficient number, since it is larger than the sum of its proper divisors (975673).

2091807 is a wasteful number, since it uses less digits than its factorization.

2091807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3542 (or 3539 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2091807 is about 1446.3080584716. The cubic root of 2091807 is about 127.8911631802.

It can be divided in two parts, 209 and 1807, that added together give a triangular number (2016 = T₆₃).

The spelling of 2091807 in words is "two million, ninety-one thousand, eight hundred seven".