428229917 has 4 divisors (see below), whose sum is σ = 430794336. Its totient is φ = 425665500.

The previous prime is 428229887. The next prime is 428229941. The reversal of 428229917 is 719922824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428229917 - 2⁶ = 428229853 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 (428229517) 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, 1281959 + ... + 1282292.

It is an arithmetic number, because the mean of its divisors is an integer number (107698584).

Almost surely, 2^428229917 is an apocalyptic number.

It is an amenable number.

428229917 is a deficient number, since it is larger than the sum of its proper divisors (2564419).

428229917 is a wasteful number, since it uses less digits than its factorization.

428229917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564418.

The product of its digits is 145152, while the sum is 44.

The square root of 428229917 is about 20693.7168483576. The cubic root of 428229917 is about 753.7471243085.

The spelling of 428229917 in words is "four hundred twenty-eight million, two hundred twenty-nine thousand, nine hundred seventeen".