42491820 has 144 divisors (see below), whose sum is σ = 140767200. Its totient is φ = 9547776.

The previous prime is 42491819. The next prime is 42491831. The reversal of 42491820 is 2819424.

42491820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285106 + ... + 285254.

It is an arithmetic number, because the mean of its divisors is an integer number (977550).

Almost surely, 2^42491820 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 42491820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70383600).

42491820 is an abundant number, since it is smaller than the sum of its proper divisors (98275380).

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

42491820 is a wasteful number, since it uses less digits than its factorization.

42491820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 42491820 is about 6518.5749976509. The cubic root of 42491820 is about 348.9542116649.

The spelling of 42491820 in words is "forty-two million, four hundred ninety-one thousand, eight hundred twenty".