3705509 has 2 divisors, whose sum is σ = 3705510. Its totient is φ = 3705508.

The previous prime is 3705503. The next prime is 3705511. The reversal of 3705509 is 9055073.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3621409 + 84100 = 1903^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 3705509 - 2¹⁶ = 3639973 is a prime.

Together with 3705511, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3705503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1852754 + 1852755.

It is an arithmetic number, because the mean of its divisors is an integer number (1852755).

Almost surely, 2^3705509 is an apocalyptic number.

It is an amenable number.

3705509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3705509 is an equidigital number, since it uses as much as digits as its factorization.

3705509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4725, while the sum is 29.

The square root of 3705509 is about 1924.9698698941. The cubic root of 3705509 is about 154.7447620332.

The spelling of 3705509 in words is "three million, seven hundred five thousand, five hundred nine".