42018781 has 8 divisors (see below), whose sum is σ = 50846400. Its totient is φ = 33897408.

The previous prime is 42018763. The next prime is 42018803. The reversal of 42018781 is 18781024.

42018781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42018781 - 2¹⁵ = 41986013 is a prime.

It is a super-2 number, since 2×42018781² = 3531155913451922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42018731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176431 + ... + 176668.

It is an arithmetic number, because the mean of its divisors is an integer number (6355800).

Almost surely, 2^42018781 is an apocalyptic number.

It is an amenable number.

42018781 is a deficient number, since it is larger than the sum of its proper divisors (8827619).

42018781 is a wasteful number, since it uses less digits than its factorization.

42018781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353123.

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

The square root of 42018781 is about 6482.1895220674. The cubic root of 42018781 is about 347.6544688759.

The spelling of 42018781 in words is "forty-two million, eighteen thousand, seven hundred eighty-one".