42800155 has 4 divisors (see below), whose sum is σ = 51360192. Its totient is φ = 34240120.

The previous prime is 42800137. The next prime is 42800159. The reversal of 42800155 is 55100824.

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

It is not a de Polignac number, because 42800155 - 2⁹ = 42799643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42800159) 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, 4280011 + ... + 4280020.

It is an arithmetic number, because the mean of its divisors is an integer number (12840048).

Almost surely, 2^42800155 is an apocalyptic number.

42800155 is a deficient number, since it is larger than the sum of its proper divisors (8560037).

42800155 is an equidigital number, since it uses as much as digits as its factorization.

42800155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560036.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 42800155 is about 6542.1827397284. The cubic root of 42800155 is about 349.7962215143.

Adding to 42800155 its reverse (55100824), we get a palindrome (97900979).

The spelling of 42800155 in words is "forty-two million, eight hundred thousand, one hundred fifty-five".