442402405 has 4 divisors (see below), whose sum is σ = 530882892. Its totient is φ = 353921920.

The previous prime is 442402397. The next prime is 442402409. The reversal of 442402405 is 504204244.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 229037956 + 213364449 = 15134^2 + 14607^2 .

It is not a de Polignac number, because 442402405 - 2³ = 442402397 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 442402405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442402409) 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, 44240236 + ... + 44240245.

It is an arithmetic number, because the mean of its divisors is an integer number (132720723).

Almost surely, 2^442402405 is an apocalyptic number.

It is an amenable number.

442402405 is a deficient number, since it is larger than the sum of its proper divisors (88480487).

442402405 is an equidigital number, since it uses as much as digits as its factorization.

442402405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88480486.

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 442402405 is about 21033.3640913668. The cubic root of 442402405 is about 761.9722579530.

Adding to 442402405 its reverse (504204244), we get a palindrome (946606649).

The spelling of 442402405 in words is "four hundred forty-two million, four hundred two thousand, four hundred five".