420409867 has 2 divisors, whose sum is σ = 420409868. Its totient is φ = 420409866.

The previous prime is 420409861. The next prime is 420409901. The reversal of 420409867 is 768904024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420409867 is a prime.

It is not a weakly prime, because it can be changed into another prime (420409861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210204933 + 210204934.

It is an arithmetic number, because the mean of its divisors is an integer number (210204934).

Almost surely, 2^420409867 is an apocalyptic number.

420409867 is a deficient number, since it is larger than the sum of its proper divisors (1).

420409867 is an equidigital number, since it uses as much as digits as its factorization.

420409867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 420409867 is about 20503.8988243700. The cubic root of 420409867 is about 749.1307660026.

The spelling of 420409867 in words is "four hundred twenty million, four hundred nine thousand, eight hundred sixty-seven".