421385809 has 8 divisors (see below), whose sum is σ = 454790952. Its totient is φ = 388122240.

The previous prime is 421385773. The next prime is 421385831. The reversal of 421385809 is 908583124.

It can be written as a sum of positive squares in 4 ways, for example, as 33177600 + 388208209 = 5760^2 + 19703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421385809 - 2⁹ = 421385297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421385009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29164 + ... + 41149.

It is an arithmetic number, because the mean of its divisors is an integer number (56848869).

Almost surely, 2^421385809 is an apocalyptic number.

It is an amenable number.

421385809 is a deficient number, since it is larger than the sum of its proper divisors (33405143).

421385809 is a wasteful number, since it uses less digits than its factorization.

421385809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70787.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 421385809 is about 20527.6839658058. The cubic root of 421385809 is about 749.7099969158.

The spelling of 421385809 in words is "four hundred twenty-one million, three hundred eighty-five thousand, eight hundred nine".