42705831 has 8 divisors (see below), whose sum is σ = 65075584. Its totient is φ = 24403320.

The previous prime is 42705827. The next prime is 42705833. The reversal of 42705831 is 13850724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42705831 - 2² = 42705827 is a prime.

It is a super-2 number, since 2×42705831² = 3647576002801122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42705833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016785 + ... + 1016826.

It is an arithmetic number, because the mean of its divisors is an integer number (8134448).

Almost surely, 2^42705831 is an apocalyptic number.

42705831 is a deficient number, since it is larger than the sum of its proper divisors (22369753).

42705831 is a wasteful number, since it uses less digits than its factorization.

42705831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033621.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 42705831 is about 6534.9698545594. The cubic root of 42705831 is about 349.5390694370.

It can be divided in two parts, 4270 and 5831, that added together give a palindrome (10101).

The spelling of 42705831 in words is "forty-two million, seven hundred five thousand, eight hundred thirty-one".