42191928 has 40 divisors (see below), whose sum is σ = 118178280. Its totient is φ = 14063760.

The previous prime is 42191917. The next prime is 42191957. The reversal of 42191928 is 82919124.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 42191892 and 42191901.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 31908 + ... + 33203.

It is an arithmetic number, because the mean of its divisors is an integer number (2954457).

Almost surely, 2^42191928 is an apocalyptic number.

It is an amenable number.

42191928 is an abundant number, since it is smaller than the sum of its proper divisors (75986352).

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

42191928 is a wasteful number, since it uses less digits than its factorization.

42191928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65129 (or 65116 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 42191928 is about 6495.5313870383. The cubic root of 42191928 is about 348.1313416240.

The spelling of 42191928 in words is "forty-two million, one hundred ninety-one thousand, nine hundred twenty-eight".