42781145 has 8 divisors (see below), whose sum is σ = 56004480. Its totient is φ = 31113520.

The previous prime is 42781099. The next prime is 42781159. The reversal of 42781145 is 54118724.

It is a happy number.

42781145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 42781145 - 2¹⁰ = 42780121 is a prime.

It is a super-2 number, since 2×42781145² = 3660452735022050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388865 + ... + 388974.

It is an arithmetic number, because the mean of its divisors is an integer number (7000560).

Almost surely, 2^42781145 is an apocalyptic number.

It is an amenable number.

42781145 is a deficient number, since it is larger than the sum of its proper divisors (13223335).

42781145 is a wasteful number, since it uses less digits than its factorization.

42781145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777855.

The product of its digits is 8960, while the sum is 32.

The square root of 42781145 is about 6540.7296993531. The cubic root of 42781145 is about 349.7444256668.

Adding to 42781145 its reverse (54118724), we get a palindrome (96899869).

It can be divided in two parts, 42 and 781145, that added together give a palindrome (781187).

The spelling of 42781145 in words is "forty-two million, seven hundred eighty-one thousand, one hundred forty-five".