42240399 has 4 divisors (see below), whose sum is σ = 56320536. Its totient is φ = 28160264.

The previous prime is 42240391. The next prime is 42240409. The reversal of 42240399 is 99304224.

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 42240399 - 2³ = 42240391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42240391) 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, 7040064 + ... + 7040069.

It is an arithmetic number, because the mean of its divisors is an integer number (14080134).

Almost surely, 2^42240399 is an apocalyptic number.

42240399 is a deficient number, since it is larger than the sum of its proper divisors (14080137).

42240399 is a wasteful number, since it uses less digits than its factorization.

42240399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14080136.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 42240399 is about 6499.2614195768. The cubic root of 42240399 is about 348.2646042118.

The spelling of 42240399 in words is "forty-two million, two hundred forty thousand, three hundred ninety-nine".