426666921 has 8 divisors (see below), whose sum is σ = 577380384. Its totient is φ = 280199040.

The previous prime is 426666917. The next prime is 426666953. The reversal of 426666921 is 129666624.

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

It is not a de Polignac number, because 426666921 - 2² = 426666917 is a prime.

It is a super-2 number, since 2×426666921² = 364089322951240482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (426666971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061160 + ... + 1061561.

It is an arithmetic number, because the mean of its divisors is an integer number (72172548).

Almost surely, 2^426666921 is an apocalyptic number.

It is an amenable number.

426666921 is a deficient number, since it is larger than the sum of its proper divisors (150713463).

426666921 is a wasteful number, since it uses less digits than its factorization.

426666921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122791.

The product of its digits is 186624, while the sum is 42.

The square root of 426666921 is about 20655.9173362018. The cubic root of 426666921 is about 752.8289726903.

The spelling of 426666921 in words is "four hundred twenty-six million, six hundred sixty-six thousand, nine hundred twenty-one".