42807239 has 4 divisors (see below), whose sum is σ = 43851360. Its totient is φ = 41763120.

The previous prime is 42807229. The next prime is 42807257. The reversal of 42807239 is 93270824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42807239 - 2⁸ = 42806983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42807199 and 42807208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42807229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521999 + ... + 522080.

It is an arithmetic number, because the mean of its divisors is an integer number (10962840).

Almost surely, 2^42807239 is an apocalyptic number.

42807239 is a deficient number, since it is larger than the sum of its proper divisors (1044121).

42807239 is a wasteful number, since it uses less digits than its factorization.

42807239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044120.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 42807239 is about 6542.7241268450. The cubic root of 42807239 is about 349.8155191059.

The spelling of 42807239 in words is "forty-two million, eight hundred seven thousand, two hundred thirty-nine".