42785455 has 4 divisors (see below), whose sum is σ = 51342552. Its totient is φ = 34228360.

The previous prime is 42785441. The next prime is 42785459. The reversal of 42785455 is 55458724.

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

It is not a de Polignac number, because 42785455 - 2⁵ = 42785423 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42785459) 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, 4278541 + ... + 4278550.

It is an arithmetic number, because the mean of its divisors is an integer number (12835638).

Almost surely, 2^42785455 is an apocalyptic number.

42785455 is a deficient number, since it is larger than the sum of its proper divisors (8557097).

42785455 is an equidigital number, since it uses as much as digits as its factorization.

42785455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557096.

The product of its digits is 224000, while the sum is 40.

The square root of 42785455 is about 6541.0591649977. The cubic root of 42785455 is about 349.7561703100.

The spelling of 42785455 in words is "forty-two million, seven hundred eighty-five thousand, four hundred fifty-five".