428219421 has 16 divisors (see below), whose sum is σ = 660787200. Its totient is φ = 241598448.

The previous prime is 428219417. The next prime is 428219431. The reversal of 428219421 is 124912824.

It is not a de Polignac number, because 428219421 - 2² = 428219417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428219411) 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 15 ways as a sum of consecutive naturals, for example, 127401 + ... + 130718.

It is an arithmetic number, because the mean of its divisors is an integer number (41299200).

Almost surely, 2^428219421 is an apocalyptic number.

It is an amenable number.

428219421 is a deficient number, since it is larger than the sum of its proper divisors (232567779).

428219421 is a wasteful number, since it uses less digits than its factorization.

428219421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258208.

The product of its digits is 9216, while the sum is 33.

The square root of 428219421 is about 20693.4632432563. The cubic root of 428219421 is about 753.7409660944.

The spelling of 428219421 in words is "four hundred twenty-eight million, two hundred nineteen thousand, four hundred twenty-one".