42817155 has 16 divisors (see below), whose sum is σ = 68593824. Its totient is φ = 22807040.

The previous prime is 42817139. The next prime is 42817157. The reversal of 42817155 is 55171824.

It is not a de Polignac number, because 42817155 - 2⁴ = 42817139 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (42817157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16507 + ... + 18923.

It is an arithmetic number, because the mean of its divisors is an integer number (4287114).

Almost surely, 2^42817155 is an apocalyptic number.

42817155 is a deficient number, since it is larger than the sum of its proper divisors (25776669).

42817155 is a wasteful number, since it uses less digits than its factorization.

42817155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606.

The product of its digits is 11200, while the sum is 33.

The square root of 42817155 is about 6543.4818712976. The cubic root of 42817155 is about 349.8425278001.

Adding to 42817155 its reverse (55171824), we get a palindrome (97988979).

The spelling of 42817155 in words is "forty-two million, eight hundred seventeen thousand, one hundred fifty-five".