42819831 has 6 divisors (see below), whose sum is σ = 61850880. Its totient is φ = 28546548.

The previous prime is 42819827. The next prime is 42819851. The reversal of 42819831 is 13891824.

It is not a de Polignac number, because 42819831 - 2² = 42819827 is a prime.

It is a super-2 number, since 2×42819831² = 3667075853737122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42819811) 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, 2378871 + ... + 2378888.

It is an arithmetic number, because the mean of its divisors is an integer number (10308480).

Almost surely, 2^42819831 is an apocalyptic number.

42819831 is a deficient number, since it is larger than the sum of its proper divisors (19031049).

42819831 is a wasteful number, since it uses less digits than its factorization.

42819831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757765 (or 4757762 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 42819831 is about 6543.6863463953. The cubic root of 42819831 is about 349.8498158377.

The spelling of 42819831 in words is "forty-two million, eight hundred nineteen thousand, eight hundred thirty-one".