42171828 has 24 divisors (see below), whose sum is σ = 98635488. Its totient is φ = 14023776.

The previous prime is 42171809. The next prime is 42171853. The reversal of 42171828 is 82817124.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1350 + ... + 9282.

It is an arithmetic number, because the mean of its divisors is an integer number (4109812).

Almost surely, 2^42171828 is an apocalyptic number.

It is an amenable number.

42171828 is an abundant number, since it is smaller than the sum of its proper divisors (56463660).

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

42171828 is a wasteful number, since it uses less digits than its factorization.

42171828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8383 (or 8381 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 42171828 is about 6493.9839851974. The cubic root of 42171828 is about 348.0760502308.

The spelling of 42171828 in words is "forty-two million, one hundred seventy-one thousand, eight hundred twenty-eight".