420281909 has 4 divisors (see below), whose sum is σ = 420342720. Its totient is φ = 420221100.

The previous prime is 420281903. The next prime is 420281923. The reversal of 420281909 is 909182024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420281909 - 2⁴ = 420281893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420281903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18479 + ... + 34380.

It is an arithmetic number, because the mean of its divisors is an integer number (105085680).

Almost surely, 2^420281909 is an apocalyptic number.

It is an amenable number.

420281909 is a deficient number, since it is larger than the sum of its proper divisors (60811).

420281909 is an equidigital number, since it uses as much as digits as its factorization.

420281909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60810.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 420281909 is about 20500.7782535200. The cubic root of 420281909 is about 749.0547552577.

The spelling of 420281909 in words is "four hundred twenty million, two hundred eighty-one thousand, nine hundred nine".