2097409 has 4 divisors (see below), whose sum is σ = 2220804. Its totient is φ = 1974016.

The previous prime is 2097401. The next prime is 2097421. The reversal of 2097409 is 9047902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9047902 = 2 ⋅4523951.

It can be written as a sum of positive squares in 2 ways, for example, as 1703025 + 394384 = 1305^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2097409 - 2³ = 2097401 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2097401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61672 + ... + 61705.

It is an arithmetic number, because the mean of its divisors is an integer number (555201).

2^2097409 is an apocalyptic number.

It is an amenable number.

2097409 is a deficient number, since it is larger than the sum of its proper divisors (123395).

2097409 is a wasteful number, since it uses less digits than its factorization.

2097409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123394.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 2097409 is about 1448.2434187663. The cubic root of 2097409 is about 128.0052284648.

The spelling of 2097409 in words is "two million, ninety-seven thousand, four hundred nine".