42173784 has 80 divisors (see below), whose sum is σ = 121387200. Its totient is φ = 13670208.

The previous prime is 42173759. The next prime is 42173797. The reversal of 42173784 is 48737124.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23097 + ... + 24855.

It is an arithmetic number, because the mean of its divisors is an integer number (1517340).

Almost surely, 2^42173784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42173784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60693600).

42173784 is an abundant number, since it is smaller than the sum of its proper divisors (79213416).

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

42173784 is a wasteful number, since it uses less digits than its factorization.

42173784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814 (or 1801 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 42173784 is about 6494.1345843769. The cubic root of 42173784 is about 348.0814315976.

It can be divided in two parts, 421737 and 84, that added together give a triangular number (421821 = T₉₁₈).

The spelling of 42173784 in words is "forty-two million, one hundred seventy-three thousand, seven hundred eighty-four".