42686881 has 8 divisors (see below), whose sum is σ = 45276840. Its totient is φ = 40105728.

The previous prime is 42686867. The next prime is 42686911. The reversal of 42686881 is 18868624.

It can be written as a sum of positive squares in 4 ways, for example, as 20784481 + 21902400 = 4559^2 + 4680^2 .

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 42686881 - 2⁵ = 42686849 is a prime.

It is a super-3 number, since 3×42686881³ (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 not an unprimeable number, because it can be changed into a prime (42686801) 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, 9655 + ... + 13363.

It is an arithmetic number, because the mean of its divisors is an integer number (5659605).

Almost surely, 2^42686881 is an apocalyptic number.

It is an amenable number.

42686881 is a deficient number, since it is larger than the sum of its proper divisors (2589959).

42686881 is a wasteful number, since it uses less digits than its factorization.

42686881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403.

The product of its digits is 147456, while the sum is 43.

The square root of 42686881 is about 6533.5198017608. The cubic root of 42686881 is about 349.4873610779.

The spelling of 42686881 in words is "forty-two million, six hundred eighty-six thousand, eight hundred eighty-one".