3909709 has 2 divisors, whose sum is σ = 3909710. Its totient is φ = 3909708.

The previous prime is 3909707. The next prime is 3909733. The reversal of 3909709 is 9079093.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3433609 + 476100 = 1853^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 3909709 - 2¹ = 3909707 is a prime.

Together with 3909707, it forms a pair of twin primes.

3909709 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3909707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1954854 + 1954855.

It is an arithmetic number, because the mean of its divisors is an integer number (1954855).

Almost surely, 2^3909709 is an apocalyptic number.

It is an amenable number.

3909709 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909709 is an equidigital number, since it uses as much as digits as its factorization.

3909709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 3909709 is about 1977.2984094466. The cubic root of 3909709 is about 157.5366035695.

The spelling of 3909709 in words is "three million, nine hundred nine thousand, seven hundred nine".