42685381 has 8 divisors (see below), whose sum is σ = 45346400. Its totient is φ = 40065840.

The previous prime is 42685337. The next prime is 42685417. The reversal of 42685381 is 18358624.

It is a happy number.

42685381 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 42685381 - 2¹⁵ = 42652613 is a prime.

It is a super-3 number, since 3×42685381³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 42685381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42685681) 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, 8235 + ... + 12376.

It is an arithmetic number, because the mean of its divisors is an integer number (5668300).

Almost surely, 2^42685381 is an apocalyptic number.

It is an amenable number.

42685381 is a deficient number, since it is larger than the sum of its proper divisors (2661019).

42685381 is a wasteful number, since it uses less digits than its factorization.

42685381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20739.

The product of its digits is 46080, while the sum is 37.

The square root of 42685381 is about 6533.4050081102. The cubic root of 42685381 is about 349.4832674144.

The spelling of 42685381 in words is "forty-two million, six hundred eighty-five thousand, three hundred eighty-one".