42320399 has 4 divisors (see below), whose sum is σ = 46167720. Its totient is φ = 38473080.

The previous prime is 42320389. The next prime is 42320401. The reversal of 42320399 is 99302324.

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 42320399 - 2⁸ = 42320143 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 (42320329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1923644 + ... + 1923665.

It is an arithmetic number, because the mean of its divisors is an integer number (11541930).

Almost surely, 2^42320399 is an apocalyptic number.

42320399 is a deficient number, since it is larger than the sum of its proper divisors (3847321).

42320399 is a wasteful number, since it uses less digits than its factorization.

42320399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847320.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 42320399 is about 6505.4130537576. The cubic root of 42320399 is about 348.4843274983.

The spelling of 42320399 in words is "forty-two million, three hundred twenty thousand, three hundred ninety-nine".