42191886 has 32 divisors (see below), whose sum is σ = 92285568. Its totient is φ = 12753440.

The previous prime is 42191861. The next prime is 42191887. The reversal of 42191886 is 68819124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42191887) 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 15 ways as a sum of consecutive naturals, for example, 50605 + ... + 51431.

It is an arithmetic number, because the mean of its divisors is an integer number (2883924).

Almost surely, 2^42191886 is an apocalyptic number.

42191886 is an abundant number, since it is smaller than the sum of its proper divisors (50093682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42191886 is a wasteful number, since it uses less digits than its factorization.

42191886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its digits is 27648, while the sum is 39.

The square root of 42191886 is about 6495.5281540457. The cubic root of 42191886 is about 348.1312261080.

It can be divided in two parts, 4219 and 1886, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 42191886 in words is "forty-two million, one hundred ninety-one thousand, eight hundred eighty-six".