4239509 has 2 divisors, whose sum is σ = 4239510. Its totient is φ = 4239508.

The previous prime is 4239493. The next prime is 4239517. The reversal of 4239509 is 9059324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3411409 + 828100 = 1847^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 4239509 - 2⁴ = 4239493 is a prime.

It is a super-2 number, since 2×4239509² = 35946873122162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4232509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2119754 + 2119755.

It is an arithmetic number, because the mean of its divisors is an integer number (2119755).

Almost surely, 2^4239509 is an apocalyptic number.

It is an amenable number.

4239509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4239509 is an equidigital number, since it uses as much as digits as its factorization.

4239509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 4239509 is about 2059.0067994060. The cubic root of 4239509 is about 161.8471988053.

The spelling of 4239509 in words is "four million, two hundred thirty-nine thousand, five hundred nine".