42440407 has 4 divisors (see below), whose sum is σ = 42471576. Its totient is φ = 42409240.

The previous prime is 42440401. The next prime is 42440423. The reversal of 42440407 is 70404424.

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 42440407 - 2¹¹ = 42438359 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 (42440401) 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, 13444 + ... + 16297.

It is an arithmetic number, because the mean of its divisors is an integer number (10617894).

Almost surely, 2^42440407 is an apocalyptic number.

42440407 is a deficient number, since it is larger than the sum of its proper divisors (31169).

42440407 is a wasteful number, since it uses less digits than its factorization.

42440407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31168.

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 42440407 is about 6514.6302274189. The cubic root of 42440407 is about 348.8134157535.

The spelling of 42440407 in words is "forty-two million, four hundred forty thousand, four hundred seven".