42449981 has 8 divisors (see below), whose sum is σ = 48717504. Its totient is φ = 36233280.

The previous prime is 42449963. The next prime is 42450007. The reversal of 42449981 is 18994424.

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 42449981 - 2¹⁰ = 42448957 is a prime.

It is a super-2 number, since 2×42449981² = 3604001773800722, 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 (42449581) 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, 10895 + ... + 14268.

It is an arithmetic number, because the mean of its divisors is an integer number (6089688).

Almost surely, 2^42449981 is an apocalyptic number.

It is an amenable number.

42449981 is a deficient number, since it is larger than the sum of its proper divisors (6267523).

42449981 is a wasteful number, since it uses less digits than its factorization.

42449981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25411.

The product of its digits is 82944, while the sum is 41.

The square root of 42449981 is about 6515.3649936132. The cubic root of 42449981 is about 348.8396430275.

It can be divided in two parts, 424 and 49981, that added together give a palindrome (50405).

The spelling of 42449981 in words is "forty-two million, four hundred forty-nine thousand, nine hundred eighty-one".