420906809 has 16 divisors (see below), whose sum is σ = 440010240. Its totient is φ = 402192000.

The previous prime is 420906803. The next prime is 420906839. The reversal of 420906809 is 908609024.

It is a cyclic number.

It is not a de Polignac number, because 420906809 - 2⁴ = 420906793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420906803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497749 + ... + 1498029.

It is an arithmetic number, because the mean of its divisors is an integer number (27500640).

Almost surely, 2^420906809 is an apocalyptic number.

It is an amenable number.

420906809 is a deficient number, since it is larger than the sum of its proper divisors (19103431).

420906809 is a wasteful number, since it uses less digits than its factorization.

420906809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 420906809 is about 20516.0134772816. The cubic root of 420906809 is about 749.4258177170.

The spelling of 420906809 in words is "four hundred twenty million, nine hundred six thousand, eight hundred nine".