424520405 has 4 divisors (see below), whose sum is σ = 509424492. Its totient is φ = 339616320.

The previous prime is 424520359. The next prime is 424520419. The reversal of 424520405 is 504025424.

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 125126596 + 299393809 = 11186^2 + 17303^2 .

It is not a de Polignac number, because 424520405 - 2⁸ = 424520149 is a prime.

It is a super-2 number, since 2×424520405² = 360435148522728050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42452036 + ... + 42452045.

It is an arithmetic number, because the mean of its divisors is an integer number (127356123).

Almost surely, 2^424520405 is an apocalyptic number.

It is an amenable number.

424520405 is a deficient number, since it is larger than the sum of its proper divisors (84904087).

424520405 is an equidigital number, since it uses as much as digits as its factorization.

424520405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84904086.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 424520405 is about 20603.8929574001. The cubic root of 424520405 is about 751.5643820836.

Adding to 424520405 its reverse (504025424), we get a palindrome (928545829).

The spelling of 424520405 in words is "four hundred twenty-four million, five hundred twenty thousand, four hundred five".