2091739 has 4 divisors (see below), whose sum is σ = 2252656. Its totient is φ = 1930824.

The previous prime is 2091737. The next prime is 2091763. The reversal of 2091739 is 9371902.

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

It is a cyclic number.

It is not a de Polignac number, because 2091739 - 2¹ = 2091737 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2091739.

It is not an unprimeable number, because it can be changed into a prime (2091737) 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, 80439 + ... + 80464.

It is an arithmetic number, because the mean of its divisors is an integer number (563164).

2^2091739 is an apocalyptic number.

2091739 is a deficient number, since it is larger than the sum of its proper divisors (160917).

2091739 is a wasteful number, since it uses less digits than its factorization.

2091739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160916.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 2091739 is about 1446.2845501491. The cubic root of 2091739 is about 127.8897773460.

The spelling of 2091739 in words is "two million, ninety-one thousand, seven hundred thirty-nine".