39242509 has 4 divisors (see below), whose sum is σ = 40077504. Its totient is φ = 38407516.

The previous prime is 39242501. The next prime is 39242513. The reversal of 39242509 is 90524293.

39242509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39242509 - 2³ = 39242501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39242501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417427 + ... + 417520.

It is an arithmetic number, because the mean of its divisors is an integer number (10019376).

Almost surely, 2^39242509 is an apocalyptic number.

It is an amenable number.

39242509 is a deficient number, since it is larger than the sum of its proper divisors (834995).

39242509 is an equidigital number, since it uses as much as digits as its factorization.

39242509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834994.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 39242509 is about 6264.3841676577. The cubic root of 39242509 is about 339.8225977641.

The spelling of 39242509 in words is "thirty-nine million, two hundred forty-two thousand, five hundred nine".