42178771 has 4 divisors (see below), whose sum is σ = 42462000. Its totient is φ = 41895544.

The previous prime is 42178769. The next prime is 42178813. The reversal of 42178771 is 17787124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42178771 - 2¹ = 42178769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42178771.

It is not an unprimeable number, because it can be changed into a prime (42478771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141391 + ... + 141688.

It is an arithmetic number, because the mean of its divisors is an integer number (10615500).

Almost surely, 2^42178771 is an apocalyptic number.

42178771 is a deficient number, since it is larger than the sum of its proper divisors (283229).

42178771 is a wasteful number, since it uses less digits than its factorization.

42178771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283228.

The product of its digits is 21952, while the sum is 37.

The square root of 42178771 is about 6494.5185348877. The cubic root of 42178771 is about 348.0951511292.

The spelling of 42178771 in words is "forty-two million, one hundred seventy-eight thousand, seven hundred seventy-one".