42309828 has 72 divisors (see below), whose sum is σ = 117770016. Its totient is φ = 12806640.

The previous prime is 42309803. The next prime is 42309871. The reversal of 42309828 is 82890324.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 42309792 and 42309801.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47475 + ... + 48357.

Almost surely, 2^42309828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42309828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58885008).

42309828 is an abundant number, since it is smaller than the sum of its proper divisors (75460188).

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

42309828 is a wasteful number, since it uses less digits than its factorization.

42309828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 42309828 is about 6504.6005257817. The cubic root of 42309828 is about 348.4553096985.

The spelling of 42309828 in words is "forty-two million, three hundred nine thousand, eight hundred twenty-eight".