42308981 has 18 divisors (see below), whose sum is σ = 50381730. Its totient is φ = 35486880.

The previous prime is 42308969. The next prime is 42308989. The reversal of 42308981 is 18980324.

It is a happy number.

42308981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1464100 + 40844881 = 1210^2 + 6391^2 .

It is not a de Polignac number, because 42308981 - 2¹⁰ = 42307957 is a prime.

It is a super-2 number, since 2×42308981² = 3580099746516722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42308989) 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 17 ways as a sum of consecutive naturals, for example, 19415 + ... + 21483.

It is an arithmetic number, because the mean of its divisors is an integer number (2798985).

Almost surely, 2^42308981 is an apocalyptic number.

It is an amenable number.

42308981 is a deficient number, since it is larger than the sum of its proper divisors (8072749).

42308981 is a wasteful number, since it uses less digits than its factorization.

42308981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2093 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 42308981 is about 6504.5354176913. The cubic root of 42308981 is about 348.4529844419.

The spelling of 42308981 in words is "forty-two million, three hundred eight thousand, nine hundred eighty-one".