42831729 has 6 divisors (see below), whose sum is σ = 61868066. Its totient is φ = 28554480.

The previous prime is 42831713. The next prime is 42831751. The reversal of 42831729 is 92713824.

It can be written as a sum of positive squares in only one way, i.e., 39087504 + 3744225 = 6252^2 + 1935^2 .

It is not a de Polignac number, because 42831729 - 2⁴ = 42831713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42831693 and 42831702.

It is not an unprimeable number, because it can be changed into a prime (42831709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2379532 + ... + 2379549.

Almost surely, 2^42831729 is an apocalyptic number.

It is an amenable number.

42831729 is a deficient number, since it is larger than the sum of its proper divisors (19036337).

42831729 is a wasteful number, since it uses less digits than its factorization.

42831729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4759087 (or 4759084 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 42831729 is about 6544.5954038428. The cubic root of 42831729 is about 349.8822161495.

The spelling of 42831729 in words is "forty-two million, eight hundred thirty-one thousand, seven hundred twenty-nine".