42118819 has 4 divisors (see below), whose sum is σ = 43950096. Its totient is φ = 40287544.

The previous prime is 42118789. The next prime is 42118823. The reversal of 42118819 is 91881124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42118819 - 2¹⁷ = 41987747 is a prime.

It is a super-2 number, since 2×42118819² = 3547989827909522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42118889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915604 + ... + 915649.

It is an arithmetic number, because the mean of its divisors is an integer number (10987524).

Almost surely, 2^42118819 is an apocalyptic number.

42118819 is a deficient number, since it is larger than the sum of its proper divisors (1831277).

42118819 is a wasteful number, since it uses less digits than its factorization.

42118819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831276.

The product of its digits is 4608, while the sum is 34.

The square root of 42118819 is about 6489.9013089569. The cubic root of 42118819 is about 347.9301479344.

The spelling of 42118819 in words is "forty-two million, one hundred eighteen thousand, eight hundred nineteen".