42939281 has 16 divisors (see below), whose sum is σ = 54096000. Its totient is φ = 33108480.

The previous prime is 42939271. The next prime is 42939287. The reversal of 42939281 is 18293924.

42939281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42939281 - 2¹⁰ = 42938257 is a prime.

It is a super-2 number, since 2×42939281² = 3687563705593922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42939287) 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 15 ways as a sum of consecutive naturals, for example, 4595 + ... + 10343.

It is an arithmetic number, because the mean of its divisors is an integer number (3381000).

Almost surely, 2^42939281 is an apocalyptic number.

It is an amenable number.

42939281 is a deficient number, since it is larger than the sum of its proper divisors (11156719).

42939281 is a wasteful number, since it uses less digits than its factorization.

42939281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864.

The product of its digits is 31104, while the sum is 38.

The square root of 42939281 is about 6552.8071084078. The cubic root of 42939281 is about 350.1748269441.

The spelling of 42939281 in words is "forty-two million, nine hundred thirty-nine thousand, two hundred eighty-one".