42405043 has 4 divisors (see below), whose sum is σ = 42986008. Its totient is φ = 41824080.

The previous prime is 42405023. The next prime is 42405049. The reversal of 42405043 is 34050424.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42405043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42405049) 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, 290373 + ... + 290518.

It is an arithmetic number, because the mean of its divisors is an integer number (10746502).

Almost surely, 2^42405043 is an apocalyptic number.

42405043 is a deficient number, since it is larger than the sum of its proper divisors (580965).

42405043 is an equidigital number, since it uses as much as digits as its factorization.

42405043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580964.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42405043 is about 6511.9154632105. The cubic root of 42405043 is about 348.7165044504.

Adding to 42405043 its reverse (34050424), we get a palindrome (76455467).

The spelling of 42405043 in words is "forty-two million, four hundred five thousand, forty-three".