42971819 has 6 divisors (see below), whose sum is σ = 47233620. Its totient is φ = 39065180.

The previous prime is 42971809. The next prime is 42971821. The reversal of 42971819 is 91817924.

It is a de Polignac number, because none of the positive numbers 2^k-42971819 is a prime.

It is a super-2 number, since 2×42971819² = 3693154456337522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42971809) 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, 177449 + ... + 177690.

It is an arithmetic number, because the mean of its divisors is an integer number (7872270).

Almost surely, 2^42971819 is an apocalyptic number.

42971819 is a deficient number, since it is larger than the sum of its proper divisors (4261801).

42971819 is a wasteful number, since it uses less digits than its factorization.

42971819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355161 (or 355150 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 42971819 is about 6555.2893910185. The cubic root of 42971819 is about 350.2632550024.

It can be divided in two parts, 4297 and 1819, that added together give a palindrome (6116).

The spelling of 42971819 in words is "forty-two million, nine hundred seventy-one thousand, eight hundred nineteen".