428439739 has 8 divisors (see below), whose sum is σ = 527310560. Its totient is φ = 338985216.

The previous prime is 428439731. The next prime is 428439743. The reversal of 428439739 is 937934824.

It is a happy number.

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 428439739 - 2³ = 428439731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428439692 and 428439701.

It is not an unprimeable number, because it can be changed into a prime (428439731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2353974 + ... + 2354155.

It is an arithmetic number, because the mean of its divisors is an integer number (65913820).

Almost surely, 2^428439739 is an apocalyptic number.

428439739 is a deficient number, since it is larger than the sum of its proper divisors (98870821).

428439739 is a wasteful number, since it uses less digits than its factorization.

428439739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4708149.

The product of its digits is 1306368, while the sum is 49.

The square root of 428439739 is about 20698.7859305806. The cubic root of 428439739 is about 753.8702099840.

The spelling of 428439739 in words is "four hundred twenty-eight million, four hundred thirty-nine thousand, seven hundred thirty-nine".