419971809 has 4 divisors (see below), whose sum is σ = 559962416. Its totient is φ = 279981204.

The previous prime is 419971781. The next prime is 419971883. The reversal of 419971809 is 908179914.

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 not a de Polignac number, because 419971809 - 2⁵ = 419971777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (419971109) 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, 69995299 + ... + 69995304.

It is an arithmetic number, because the mean of its divisors is an integer number (139990604).

Almost surely, 2^419971809 is an apocalyptic number.

It is an amenable number.

419971809 is a deficient number, since it is larger than the sum of its proper divisors (139990607).

419971809 is a wasteful number, since it uses less digits than its factorization.

419971809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139990606.

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 419971809 is about 20493.2137304035. The cubic root of 419971809 is about 748.8704828865.

The spelling of 419971809 in words is "four hundred nineteen million, nine hundred seventy-one thousand, eight hundred nine".