42846781 has 4 divisors (see below), whose sum is σ = 42984864. Its totient is φ = 42708700.

The previous prime is 42846779. The next prime is 42846821. The reversal of 42846781 is 18764824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42846781 - 2¹ = 42846779 is a prime.

It is a super-2 number, since 2×42846781² = 3671693284123922, 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 (42846721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68575 + ... + 69196.

It is an arithmetic number, because the mean of its divisors is an integer number (10746216).

Almost surely, 2^42846781 is an apocalyptic number.

It is an amenable number.

42846781 is a deficient number, since it is larger than the sum of its proper divisors (138083).

42846781 is a wasteful number, since it uses less digits than its factorization.

42846781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138082.

The product of its digits is 86016, while the sum is 40.

The square root of 42846781 is about 6545.7452593269. The cubic root of 42846781 is about 349.9231967531.

The spelling of 42846781 in words is "forty-two million, eight hundred forty-six thousand, seven hundred eighty-one".