428571421 has 8 divisors (see below), whose sum is σ = 436157600. Its totient is φ = 421003440.

The previous prime is 428571389. The next prime is 428571431. The reversal of 428571421 is 124175824.

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 428571421 - 2⁵ = 428571389 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 (428571431) 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, 48310 + ... + 56488.

It is an arithmetic number, because the mean of its divisors is an integer number (54519700).

Almost surely, 2^428571421 is an apocalyptic number.

It is an amenable number.

428571421 is a deficient number, since it is larger than the sum of its proper divisors (7586179).

428571421 is an equidigital number, since it uses as much as digits as its factorization.

428571421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9099.

The product of its digits is 17920, while the sum is 34.

The square root of 428571421 is about 20701.9665974033. The cubic root of 428571421 is about 753.9474366892.

The spelling of 428571421 in words is "four hundred twenty-eight million, five hundred seventy-one thousand, four hundred twenty-one".