2039691 has 4 divisors (see below), whose sum is σ = 2719592. Its totient is φ = 1359792.

The previous prime is 2039671. The next prime is 2039731. The reversal of 2039691 is 1969302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2039691 - 2⁹ = 2039179 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2039621) 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, 339946 + ... + 339951.

It is an arithmetic number, because the mean of its divisors is an integer number (679898).

2^2039691 is an apocalyptic number.

2039691 is a deficient number, since it is larger than the sum of its proper divisors (679901).

2039691 is an equidigital number, since it uses as much as digits as its factorization.

2039691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679900.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 2039691 is about 1428.1775099756. The cubic root of 2039691 is about 126.8201102888.

The spelling of 2039691 in words is "two million, thirty-nine thousand, six hundred ninety-one".