2091787 has 4 divisors (see below), whose sum is σ = 2159296. Its totient is φ = 2024280.

The previous prime is 2091773. The next prime is 2091797. The reversal of 2091787 is 7871902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7871902 = 2 ⋅3935951.

It is a cyclic number.

It is not a de Polignac number, because 2091787 - 2⁷ = 2091659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2091707) 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, 33708 + ... + 33769.

It is an arithmetic number, because the mean of its divisors is an integer number (539824).

2^2091787 is an apocalyptic number.

2091787 is a deficient number, since it is larger than the sum of its proper divisors (67509).

2091787 is an equidigital number, since it uses as much as digits as its factorization.

2091787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67508.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 2091787 is about 1446.3011442988. The cubic root of 2091787 is about 127.8907555850.

The spelling of 2091787 in words is "two million, ninety-one thousand, seven hundred eighty-seven".