42397820 has 24 divisors (see below), whose sum is σ = 90039600. Its totient is φ = 16767872.

The previous prime is 42397783. The next prime is 42397829. The reversal of 42397820 is 2879324.

42397820 is nontrivially palindromic in base 9.

42397820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42397829) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10130 + ... + 13689.

It is an arithmetic number, because the mean of its divisors is an integer number (3751650).

Almost surely, 2^42397820 is an apocalyptic number.

It is an amenable number.

42397820 is an abundant number, since it is smaller than the sum of its proper divisors (47641780).

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

42397820 is a wasteful number, since it uses less digits than its factorization.

42397820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23917 (or 23915 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 42397820 is about 6511.3608408688. The cubic root of 42397820 is about 348.6967039569.

The spelling of 42397820 in words is "forty-two million, three hundred ninety-seven thousand, eight hundred twenty".