2099749 has 2 divisors, whose sum is σ = 2099750. Its totient is φ = 2099748.

The previous prime is 2099743. The next prime is 2099761. The reversal of 2099749 is 9479902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1483524 + 616225 = 1218^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099749 - 2⁵ = 2099717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1049874 + 1049875.

It is an arithmetic number, because the mean of its divisors is an integer number (1049875).

2^2099749 is an apocalyptic number.

It is an amenable number.

2099749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099749 is an equidigital number, since it uses as much as digits as its factorization.

2099749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 2099749 is about 1449.0510688033. The cubic root of 2099749 is about 128.0528143055.

The spelling of 2099749 in words is "two million, ninety-nine thousand, seven hundred forty-nine".