42504209 has 4 divisors (see below), whose sum is σ = 46368240. Its totient is φ = 38640180.

The previous prime is 42504181. The next prime is 42504239. The reversal of 42504209 is 90240524.

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 42504209 - 2⁸ = 42503953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42504239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1931999 + ... + 1932020.

It is an arithmetic number, because the mean of its divisors is an integer number (11592060).

Almost surely, 2^42504209 is an apocalyptic number.

It is an amenable number.

42504209 is a deficient number, since it is larger than the sum of its proper divisors (3864031).

42504209 is a wasteful number, since it uses less digits than its factorization.

42504209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864030.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 42504209 is about 6519.5252127743. The cubic root of 42504209 is about 348.9881222986.

The spelling of 42504209 in words is "forty-two million, five hundred four thousand, two hundred nine".