2665409 has 2 divisors, whose sum is σ = 2665410. Its totient is φ = 2665408.

The previous prime is 2665391. The next prime is 2665427. The reversal of 2665409 is 9045662.

It is a balanced prime because it is at equal distance from previous prime (2665391) and next prime (2665427).

It can be written as a sum of positive squares in only one way, i.e., 2334784 + 330625 = 1528^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665409 - 2²⁰ = 1616833 is a prime.

It is not a weakly prime, because it can be changed into another prime (2665459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332704 + 1332705.

It is an arithmetic number, because the mean of its divisors is an integer number (1332705).

2^2665409 is an apocalyptic number.

It is an amenable number.

2665409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665409 is an equidigital number, since it uses as much as digits as its factorization.

2665409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2665409 is about 1632.6080362414. The cubic root of 2665409 is about 138.6504510080.

The spelling of 2665409 in words is "two million, six hundred sixty-five thousand, four hundred nine".