420542405 has 4 divisors (see below), whose sum is σ = 504650892. Its totient is φ = 336433920.

The previous prime is 420542393. The next prime is 420542429. The reversal of 420542405 is 504245024.

420542405 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 51825601 + 368716804 = 7199^2 + 19202^2 .

It is not a de Polignac number, because 420542405 - 2⁸ = 420542149 is a prime.

It is a Duffinian 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, 42054236 + ... + 42054245.

It is an arithmetic number, because the mean of its divisors is an integer number (126162723).

Almost surely, 2^420542405 is an apocalyptic number.

It is an amenable number.

420542405 is a deficient number, since it is larger than the sum of its proper divisors (84108487).

420542405 is an equidigital number, since it uses as much as digits as its factorization.

420542405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84108486.

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

The square root of 420542405 is about 20507.1305891390. The cubic root of 420542405 is about 749.2094811401.

Adding to 420542405 its reverse (504245024), we get a palindrome (924787429).

The spelling of 420542405 in words is "four hundred twenty million, five hundred forty-two thousand, four hundred five".