421908706 has 8 divisors (see below), whose sum is σ = 649967580. Its totient is φ = 205252848.

The previous prime is 421908701. The next prime is 421908709. The reversal of 421908706 is 607809124.

It can be written as a sum of positive squares in 2 ways, for example, as 353101681 + 68807025 = 18791^2 + 8295^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (421908701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2850661 + ... + 2850808.

Almost surely, 2^421908706 is an apocalyptic number.

421908706 is a deficient number, since it is larger than the sum of its proper divisors (228058874).

421908706 is a wasteful number, since it uses less digits than its factorization.

421908706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701508.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 421908706 is about 20540.4164027899. The cubic root of 421908706 is about 750.0199733940.

The spelling of 421908706 in words is "four hundred twenty-one million, nine hundred eight thousand, seven hundred six".