420209899 has 2 divisors, whose sum is σ = 420209900. Its totient is φ = 420209898.

The previous prime is 420209857. The next prime is 420209903. The reversal of 420209899 is 998902024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420209899 - 2⁷ = 420209771 is a prime.

It is not a weakly prime, because it can be changed into another prime (420209849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210104949 + 210104950.

It is an arithmetic number, because the mean of its divisors is an integer number (210104950).

Almost surely, 2^420209899 is an apocalyptic number.

420209899 is a deficient number, since it is larger than the sum of its proper divisors (1).

420209899 is an equidigital number, since it uses as much as digits as its factorization.

420209899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 420209899 is about 20499.0219034958. The cubic root of 420209899 is about 749.0119724551.

The spelling of 420209899 in words is "four hundred twenty million, two hundred nine thousand, eight hundred ninety-nine".