42447181 has 12 divisors (see below), whose sum is σ = 52282908. Its totient is φ = 34242432.

The previous prime is 42447179. The next prime is 42447187. The reversal of 42447181 is 18174424.

It is a happy number.

42447181 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 2 ways, for example, as 34409956 + 8037225 = 5866^2 + 2835^2 .

It is not a de Polignac number, because 42447181 - 2¹ = 42447179 is a prime.

It is a super-2 number, since 2×42447181² = 3603526349693522, 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 (42447187) 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 11 ways as a sum of consecutive naturals, for example, 24646 + ... + 26311.

It is an arithmetic number, because the mean of its divisors is an integer number (4356909).

Almost surely, 2^42447181 is an apocalyptic number.

It is an amenable number.

42447181 is a deficient number, since it is larger than the sum of its proper divisors (9835727).

42447181 is a wasteful number, since it uses less digits than its factorization.

42447181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50988 (or 50981 counting only the distinct ones).

The product of its digits is 7168, while the sum is 31.

The square root of 42447181 is about 6515.1501133896. The cubic root of 42447181 is about 348.8319730400.

The spelling of 42447181 in words is "forty-two million, four hundred forty-seven thousand, one hundred eighty-one".