42853981 has 4 divisors (see below), whose sum is σ = 42868252. Its totient is φ = 42839712.

The previous prime is 42853973. The next prime is 42853999. The reversal of 42853981 is 18935824.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13205956 + 29648025 = 3634^2 + 5445^2 .

It is a cyclic number.

It is not a de Polignac number, because 42853981 - 2³ = 42853973 is a prime.

It is a super-2 number, since 2×42853981² = 3672927375096722, 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 (42853901) 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, 690 + ... + 9283.

It is an arithmetic number, because the mean of its divisors is an integer number (10717063).

Almost surely, 2^42853981 is an apocalyptic number.

It is an amenable number.

42853981 is a deficient number, since it is larger than the sum of its proper divisors (14271).

42853981 is an equidigital number, since it uses as much as digits as its factorization.

42853981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14270.

The product of its digits is 69120, while the sum is 40.

The square root of 42853981 is about 6546.2952117973. The cubic root of 42853981 is about 349.9427960933.

It can be divided in two parts, 42853 and 981, that added together give a palindrome (43834).

The spelling of 42853981 in words is "forty-two million, eight hundred fifty-three thousand, nine hundred eighty-one".