42440403 has 4 divisors (see below), whose sum is σ = 56587208. Its totient is φ = 28293600.

The previous prime is 42440401. The next prime is 42440423. The reversal of 42440403 is 30404424.

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

It is not a de Polignac number, because 42440403 - 2¹ = 42440401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42440403.

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, 7073398 + ... + 7073403.

It is an arithmetic number, because the mean of its divisors is an integer number (14146802).

Almost surely, 2^42440403 is an apocalyptic number.

42440403 is a deficient number, since it is larger than the sum of its proper divisors (14146805).

42440403 is a wasteful number, since it uses less digits than its factorization.

42440403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14146804.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 42440403 is about 6514.6299204176. The cubic root of 42440403 is about 348.8134047950.

Adding to 42440403 its reverse (30404424), we get a palindrome (72844827).

The spelling of 42440403 in words is "forty-two million, four hundred forty thousand, four hundred three".