42409453 has 4 divisors (see below), whose sum is σ = 42454908. Its totient is φ = 42364000.

The previous prime is 42409429. The next prime is 42409469. The reversal of 42409453 is 35490424.

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 21734244 + 20675209 = 4662^2 + 4547^2 .

It is a cyclic number.

It is not a de Polignac number, because 42409453 - 2²¹ = 40312301 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42409253) 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, 21298 + ... + 23203.

It is an arithmetic number, because the mean of its divisors is an integer number (10613727).

Almost surely, 2^42409453 is an apocalyptic number.

It is an amenable number.

42409453 is a deficient number, since it is larger than the sum of its proper divisors (45455).

42409453 is an equidigital number, since it uses as much as digits as its factorization.

42409453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45454.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 42409453 is about 6512.2540644542. The cubic root of 42409453 is about 348.7285925290.

Adding to 42409453 its reverse (35490424), we get a palindrome (77899877).

The spelling of 42409453 in words is "forty-two million, four hundred nine thousand, four hundred fifty-three".