42671844 has 18 divisors (see below), whose sum is σ = 107865030. Its totient is φ = 14223936.

The previous prime is 42671843. The next prime is 42671869. The reversal of 42671844 is 44817624.

42671844 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 only one way, i.e., 39538944 + 3132900 = 6288^2 + 1770^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1185329 = 42671844 / (4 + 2 + 6 + 7 + 1 + 8 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 42671799 and 42671808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42671843) 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 5 ways as a sum of consecutive naturals, for example, 592629 + ... + 592700.

Almost surely, 2^42671844 is an apocalyptic number.

It is an amenable number.

42671844 is an abundant number, since it is smaller than the sum of its proper divisors (65193186).

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

42671844 is a wasteful number, since it uses less digits than its factorization.

42671844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185339 (or 1185334 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 42671844 is about 6532.3689424282. The cubic root of 42671844 is about 349.4463191268.

The spelling of 42671844 in words is "forty-two million, six hundred seventy-one thousand, eight hundred forty-four".