428168839 has 4 divisors (see below), whose sum is σ = 489335824. Its totient is φ = 367001856.

The previous prime is 428168833. The next prime is 428168843. The reversal of 428168839 is 938861824.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428168839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428168792 and 428168801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428168833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30583482 + ... + 30583495.

It is an arithmetic number, because the mean of its divisors is an integer number (122333956).

Almost surely, 2^428168839 is an apocalyptic number.

428168839 is a deficient number, since it is larger than the sum of its proper divisors (61166985).

428168839 is an equidigital number, since it uses as much as digits as its factorization.

428168839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61166984.

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

The square root of 428168839 is about 20692.2410337788. The cubic root of 428168839 is about 753.7112872079.

The spelling of 428168839 in words is "four hundred twenty-eight million, one hundred sixty-eight thousand, eight hundred thirty-nine".