42781355 has 4 divisors (see below), whose sum is σ = 51337632. Its totient is φ = 34225080.

The previous prime is 42781337. The next prime is 42781391. The reversal of 42781355 is 55318724.

It is a happy number.

42781355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 42781355 - 2⁸ = 42781099 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 4278131 + ... + 4278140.

It is an arithmetic number, because the mean of its divisors is an integer number (12834408).

Almost surely, 2^42781355 is an apocalyptic number.

42781355 is a deficient number, since it is larger than the sum of its proper divisors (8556277).

42781355 is an equidigital number, since it uses as much as digits as its factorization.

42781355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8556276.

The product of its digits is 33600, while the sum is 35.

The square root of 42781355 is about 6540.7457525882. The cubic root of 42781355 is about 349.7449979299.

The spelling of 42781355 in words is "forty-two million, seven hundred eighty-one thousand, three hundred fifty-five".