428239812 has 216 divisors, whose sum is σ = 1378892928. Its totient is φ = 102453120.

The previous prime is 428239811. The next prime is 428239849. The reversal of 428239812 is 218932824.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (428239811) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 924693 + ... + 925155.

Almost surely, 2^428239812 is an apocalyptic number.

428239812 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428239812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689446464).

428239812 is an abundant number, since it is smaller than the sum of its proper divisors (950653116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

428239812 is a wasteful number, since it uses less digits than its factorization.

428239812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 499 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 428239812 is about 20693.9559292079. The cubic root of 428239812 is about 753.7529298116.

The spelling of 428239812 in words is "four hundred twenty-eight million, two hundred thirty-nine thousand, eight hundred twelve".