42042401 has 4 divisors (see below), whose sum is σ = 42123312. Its totient is φ = 41961492.

The previous prime is 42042389. The next prime is 42042439. The reversal of 42042401 is 10424024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42042401 - 2¹⁸ = 41780257 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 42042401.

It is not an unprimeable number, because it can be changed into a prime (42042491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39671 + ... + 40716.

It is an arithmetic number, because the mean of its divisors is an integer number (10530828).

Almost surely, 2^42042401 is an apocalyptic number.

It is an amenable number.

42042401 is a deficient number, since it is larger than the sum of its proper divisors (80911).

42042401 is an equidigital number, since it uses as much as digits as its factorization.

42042401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80910.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 42042401 is about 6484.0111813599. The cubic root of 42042401 is about 347.7195989613.

Adding to 42042401 its reverse (10424024), we get a palindrome (52466425).

The spelling of 42042401 in words is "forty-two million, forty-two thousand, four hundred one".