42181899 has 8 divisors (see below), whose sum is σ = 56788992. Its totient is φ = 27848040.

The previous prime is 42181897. The next prime is 42181901. The reversal of 42181899 is 99818124.

It is an interprime number because it is at equal distance from previous prime (42181897) and next prime (42181901).

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

It is not a de Polignac number, because 42181899 - 2¹ = 42181897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42181899.

It is not an unprimeable number, because it can be changed into a prime (42181891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67947 + ... + 68564.

It is an arithmetic number, because the mean of its divisors is an integer number (7098624).

Almost surely, 2^42181899 is an apocalyptic number.

42181899 is a deficient number, since it is larger than the sum of its proper divisors (14607093).

42181899 is a wasteful number, since it uses less digits than its factorization.

42181899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136617.

The product of its digits is 41472, while the sum is 42.

The square root of 42181899 is about 6494.7593488905. The cubic root of 42181899 is about 348.1037558900.

The spelling of 42181899 in words is "forty-two million, one hundred eighty-one thousand, eight hundred ninety-nine".