42444881 has 4 divisors (see below), whose sum is σ = 43480164. Its totient is φ = 41409600.

The previous prime is 42444877. The next prime is 42444889. The reversal of 42444881 is 18844424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19009600 + 23435281 = 4360^2 + 4841^2 .

It is a cyclic number.

It is not a de Polignac number, because 42444881 - 2² = 42444877 is a prime.

It is a super-2 number, since 2×42444881² = 3603135846208322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42444889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517580 + ... + 517661.

It is an arithmetic number, because the mean of its divisors is an integer number (10870041).

Almost surely, 2^42444881 is an apocalyptic number.

42444881 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42444881 is a deficient number, since it is larger than the sum of its proper divisors (1035283).

42444881 is a wasteful number, since it uses less digits than its factorization.

42444881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035282.

The product of its digits is 32768, while the sum is 35.

The square root of 42444881 is about 6514.9735993325. The cubic root of 42444881 is about 348.8256724407.

The spelling of 42444881 in words is "forty-two million, four hundred forty-four thousand, eight hundred eighty-one".