420355405 has 4 divisors (see below), whose sum is σ = 504426492. Its totient is φ = 336284320.

The previous prime is 420355399. The next prime is 420355421. The reversal of 420355405 is 504553024.

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 233295076 + 187060329 = 15274^2 + 13677^2 .

It is not a de Polignac number, because 420355405 - 2¹⁹ = 419831117 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, 42035536 + ... + 42035545.

It is an arithmetic number, because the mean of its divisors is an integer number (126106623).

Almost surely, 2^420355405 is an apocalyptic number.

It is an amenable number.

420355405 is a deficient number, since it is larger than the sum of its proper divisors (84071087).

420355405 is an equidigital number, since it uses as much as digits as its factorization.

420355405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84071086.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 420355405 is about 20502.5706924766. The cubic root of 420355405 is about 749.0984158883.

The spelling of 420355405 in words is "four hundred twenty million, three hundred fifty-five thousand, four hundred five".