420906905 has 8 divisors (see below), whose sum is σ = 531672000. Its totient is φ = 319003056.

The previous prime is 420906901. The next prime is 420906989. The reversal of 420906905 is 509609024.

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 420906905 - 2² = 420906901 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420906901) 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, 2215205 + ... + 2215394.

It is an arithmetic number, because the mean of its divisors is an integer number (66459000).

Almost surely, 2^420906905 is an apocalyptic number.

It is an amenable number.

420906905 is a deficient number, since it is larger than the sum of its proper divisors (110765095).

420906905 is a wasteful number, since it uses less digits than its factorization.

420906905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430623.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 420906905 is about 20516.0158169173. The cubic root of 420906905 is about 749.4258746931.

The spelling of 420906905 in words is "four hundred twenty million, nine hundred six thousand, nine hundred five".