42831387 has 12 divisors (see below), whose sum is σ = 62147904. Its totient is φ = 28424880.

The previous prime is 42831379. The next prime is 42831401. The reversal of 42831387 is 78313824.

42831387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42831387 - 2³ = 42831379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42831307) 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, 8664 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (5178992).

Almost surely, 2^42831387 is an apocalyptic number.

42831387 is a deficient number, since it is larger than the sum of its proper divisors (19316517).

42831387 is a wasteful number, since it uses less digits than its factorization.

42831387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21570 (or 21567 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 42831387 is about 6544.5692753611. The cubic root of 42831387 is about 349.8812849081.

The spelling of 42831387 in words is "forty-two million, eight hundred thirty-one thousand, three hundred eighty-seven".