428881939 has 4 divisors (see below), whose sum is σ = 430097256. Its totient is φ = 427666624.

The previous prime is 428881903. The next prime is 428881951. The reversal of 428881939 is 939188824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428881939 - 2¹⁹ = 428357651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428881969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607129 + ... + 607834.

It is an arithmetic number, because the mean of its divisors is an integer number (107524314).

Almost surely, 2^428881939 is an apocalyptic number.

428881939 is a deficient number, since it is larger than the sum of its proper divisors (1215317).

428881939 is a wasteful number, since it uses less digits than its factorization.

428881939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215316.

The product of its digits is 995328, while the sum is 52.

The square root of 428881939 is about 20709.4649617029. The cubic root of 428881939 is about 754.1294815944.

The spelling of 428881939 in words is "four hundred twenty-eight million, eight hundred eighty-one thousand, nine hundred thirty-nine".