421667959 has 8 divisors (see below), whose sum is σ = 424243568. Its totient is φ = 419100480.

The previous prime is 421667927. The next prime is 421667977. The reversal of 421667959 is 959766124.

It is a happy number.

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 421667959 - 2⁵ = 421667927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421667999) 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 7 ways as a sum of consecutive naturals, for example, 124924 + ... + 128254.

It is an arithmetic number, because the mean of its divisors is an integer number (53030446).

Almost surely, 2^421667959 is an apocalyptic number.

421667959 is a deficient number, since it is larger than the sum of its proper divisors (2575609).

421667959 is a wasteful number, since it uses less digits than its factorization.

421667959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065.

The product of its digits is 816480, while the sum is 49.

The square root of 421667959 is about 20534.5552423226. Note that the first 3 decimals coincide. The cubic root of 421667959 is about 749.8772889608.

The spelling of 421667959 in words is "four hundred twenty-one million, six hundred sixty-seven thousand, nine hundred fifty-nine".