428688139 has 8 divisors (see below), whose sum is σ = 467869680. Its totient is φ = 389541600.

The previous prime is 428688109. The next prime is 428688187. The reversal of 428688139 is 931886824.

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 428688139 - 2⁵ = 428688107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428688092 and 428688101.

It is not an unprimeable number, because it can be changed into a prime (428688109) 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, 21397 + ... + 36265.

It is an arithmetic number, because the mean of its divisors is an integer number (58483710).

Almost surely, 2^428688139 is an apocalyptic number.

428688139 is a deficient number, since it is larger than the sum of its proper divisors (39181541).

428688139 is a wasteful number, since it uses less digits than its factorization.

428688139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17501.

The product of its digits is 663552, while the sum is 49.

The square root of 428688139 is about 20704.7854130392. The cubic root of 428688139 is about 754.0158743289.

The spelling of 428688139 in words is "four hundred twenty-eight million, six hundred eighty-eight thousand, one hundred thirty-nine".