442144013 has 4 divisors (see below), whose sum is σ = 443281020. Its totient is φ = 441007008.

The previous prime is 442143997. The next prime is 442144033. The reversal of 442144013 is 310441244.

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 151339204 + 290804809 = 12302^2 + 17053^2 .

It is a cyclic number.

It is not a de Polignac number, because 442144013 - 2⁴ = 442143997 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 442144013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442144033) 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, 567920 + ... + 568697.

It is an arithmetic number, because the mean of its divisors is an integer number (110820255).

Almost surely, 2^442144013 is an apocalyptic number.

It is an amenable number.

442144013 is a deficient number, since it is larger than the sum of its proper divisors (1137007).

442144013 is a wasteful number, since it uses less digits than its factorization.

442144013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137006.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 442144013 is about 21027.2207626210. The cubic root of 442144013 is about 761.8238818158.

Adding to 442144013 its reverse (310441244), we get a palindrome (752585257).

The spelling of 442144013 in words is "four hundred forty-two million, one hundred forty-four thousand, thirteen".