42390828 has 36 divisors (see below), whose sum is σ = 107413488. Its totient is φ = 14096160.

The previous prime is 42390827. The next prime is 42390841. The reversal of 42390828 is 82809324.

It is a tau number, because it is divible by the number of its divisors (36).

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 = 42390792 and 42390801.

It is not an unprimeable number, because it can be changed into a prime (42390827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16938 + ... + 19278.

It is an arithmetic number, because the mean of its divisors is an integer number (2983708).

Almost surely, 2^42390828 is an apocalyptic number.

It is an amenable number.

42390828 is an abundant number, since it is smaller than the sum of its proper divisors (65022660).

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

42390828 is a wasteful number, since it uses less digits than its factorization.

42390828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854 (or 2849 counting only the distinct ones).

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

The square root of 42390828 is about 6510.8239109962. The cubic root of 42390828 is about 348.6775345641.

The spelling of 42390828 in words is "forty-two million, three hundred ninety thousand, eight hundred twenty-eight".