442540453 has 4 divisors (see below), whose sum is σ = 445359340. Its totient is φ = 439721568.

The previous prime is 442540451. The next prime is 442540471. The reversal of 442540453 is 354045244.

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 322813089 + 119727364 = 17967^2 + 10942^2 .

It is a cyclic number.

It is not a de Polignac number, because 442540453 - 2¹ = 442540451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442540451) 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, 1409208 + ... + 1409521.

It is an arithmetic number, because the mean of its divisors is an integer number (111339835).

Almost surely, 2^442540453 is an apocalyptic number.

It is an amenable number.

442540453 is a deficient number, since it is larger than the sum of its proper divisors (2818887).

442540453 is a wasteful number, since it uses less digits than its factorization.

442540453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818886.

The product of its (nonzero) digits is 38400, while the sum is 31.

The square root of 442540453 is about 21036.6454787830. The cubic root of 442540453 is about 762.0515054179.

Adding to 442540453 its reverse (354045244), we get a palindrome (796585697).

The spelling of 442540453 in words is "four hundred forty-two million, five hundred forty thousand, four hundred fifty-three".