42856581 has 8 divisors (see below), whose sum is σ = 57296800. Its totient is φ = 28493712.

The previous prime is 42856579. The next prime is 42856589. The reversal of 42856581 is 18565824.

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

It is not a de Polignac number, because 42856581 - 2¹ = 42856579 is a prime.

It is a super-2 number, since 2×42856581² = 3673373070019122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42856589) 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, 18031 + ... + 20268.

It is an arithmetic number, because the mean of its divisors is an integer number (7162100).

Almost surely, 2^42856581 is an apocalyptic number.

It is an amenable number.

42856581 is a deficient number, since it is larger than the sum of its proper divisors (14440219).

42856581 is a wasteful number, since it uses less digits than its factorization.

42856581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38675.

The product of its digits is 76800, while the sum is 39.

The square root of 42856581 is about 6546.4937943910. The cubic root of 42856581 is about 349.9498730933.

The spelling of 42856581 in words is "forty-two million, eight hundred fifty-six thousand, five hundred eighty-one".