42178081 has 8 divisors (see below), whose sum is σ = 48434400. Its totient is φ = 36325440.

The previous prime is 42178063. The next prime is 42178109. The reversal of 42178081 is 18087124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42178081 - 2¹¹ = 42176033 is a prime.

It is a super-2 number, since 2×42178081² = 3557981033685122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42178001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100696 + ... + 101113.

It is an arithmetic number, because the mean of its divisors is an integer number (6054300).

Almost surely, 2^42178081 is an apocalyptic number.

It is an amenable number.

42178081 is a deficient number, since it is larger than the sum of its proper divisors (6256319).

42178081 is a wasteful number, since it uses less digits than its factorization.

42178081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201839.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 42178081 is about 6494.4654129497. The cubic root of 42178081 is about 348.0932529629.

The spelling of 42178081 in words is "forty-two million, one hundred seventy-eight thousand, eighty-one".