420793909 has 2 divisors, whose sum is σ = 420793910. Its totient is φ = 420793908.

The previous prime is 420793903. The next prime is 420793913. The reversal of 420793909 is 909397024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413919025 + 6874884 = 20345^2 + 2622^2 .

It is a cyclic number.

It is not a de Polignac number, because 420793909 - 2⁷ = 420793781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420793903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210396954 + 210396955.

It is an arithmetic number, because the mean of its divisors is an integer number (210396955).

Almost surely, 2^420793909 is an apocalyptic number.

It is an amenable number.

420793909 is a deficient number, since it is larger than the sum of its proper divisors (1).

420793909 is an equidigital number, since it uses as much as digits as its factorization.

420793909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 420793909 is about 20513.2617835390. The cubic root of 420793909 is about 749.3588054638.

The spelling of 420793909 in words is "four hundred twenty million, seven hundred ninety-three thousand, nine hundred nine".