42186919 has 8 divisors (see below), whose sum is σ = 43923440. Its totient is φ = 40481856.

The previous prime is 42186889. The next prime is 42186931. The reversal of 42186919 is 91968124.

42186919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42186919 - 2⁹ = 42186407 is a prime.

It is a super-2 number, since 2×42186919² = 3559472269425122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42186719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5109 + ... + 10510.

It is an arithmetic number, because the mean of its divisors is an integer number (5490430).

Almost surely, 2^42186919 is an apocalyptic number.

42186919 is a deficient number, since it is larger than the sum of its proper divisors (1736521).

42186919 is a wasteful number, since it uses less digits than its factorization.

42186919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15729.

The product of its digits is 31104, while the sum is 40.

The square root of 42186919 is about 6495.1458028284. The cubic root of 42186919 is about 348.1175644318.

The spelling of 42186919 in words is "forty-two million, one hundred eighty-six thousand, nine hundred nineteen".