42447831 has 8 divisors (see below), whose sum is σ = 56645760. Its totient is φ = 28274232.

The previous prime is 42447829. The next prime is 42447869. The reversal of 42447831 is 13874424.

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

It is not a de Polignac number, because 42447831 - 2¹ = 42447829 is a prime.

It is a super-2 number, since 2×42447831² = 3603636713209122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 42447792 and 42447801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42447131) 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, 1521 + ... + 9338.

It is an arithmetic number, because the mean of its divisors is an integer number (7080720).

Almost surely, 2^42447831 is an apocalyptic number.

42447831 is a deficient number, since it is larger than the sum of its proper divisors (14197929).

42447831 is a wasteful number, since it uses less digits than its factorization.

42447831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12165.

The product of its digits is 21504, while the sum is 33.

The square root of 42447831 is about 6515.1999969303. The cubic root of 42447831 is about 348.8337536029.

The spelling of 42447831 in words is "forty-two million, four hundred forty-seven thousand, eight hundred thirty-one".