420530405 has 16 divisors (see below), whose sum is σ = 513641520. Its totient is φ = 330473472.

The previous prime is 420530389. The next prime is 420530417. The reversal of 420530405 is 504035024.

It can be written as a sum of positive squares in 8 ways, for example, as 3104644 + 417425761 = 1762^2 + 20431^2 .

It is a cyclic number.

It is not a de Polignac number, because 420530405 - 2⁴ = 420530389 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 63281 + ... + 69609.

It is an arithmetic number, because the mean of its divisors is an integer number (32102595).

Almost surely, 2^420530405 is an apocalyptic number.

It is an amenable number.

420530405 is a deficient number, since it is larger than the sum of its proper divisors (93111115).

420530405 is a wasteful number, since it uses less digits than its factorization.

420530405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6568.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 420530405 is about 20506.8380058945. The cubic root of 420530405 is about 749.2023549469.

Adding to 420530405 its reverse (504035024), we get a palindrome (924565429).

The spelling of 420530405 in words is "four hundred twenty million, five hundred thirty thousand, four hundred five".