42000155 has 4 divisors (see below), whose sum is σ = 50400192. Its totient is φ = 33600120.

The previous prime is 42000137. The next prime is 42000191. The reversal of 42000155 is 55100024.

42000155 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 42000155 - 2¹⁴ = 41983771 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, 4200011 + ... + 4200020.

It is an arithmetic number, because the mean of its divisors is an integer number (12600048).

Almost surely, 2^42000155 is an apocalyptic number.

42000155 is a deficient number, since it is larger than the sum of its proper divisors (8400037).

42000155 is an equidigital number, since it uses as much as digits as its factorization.

42000155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8400036.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 42000155 is about 6480.7526569064. The cubic root of 42000155 is about 347.6030920946.

Adding to 42000155 its reverse (55100024), we get a palindrome (97100179).

The spelling of 42000155 in words is "forty-two million, one hundred fifty-five", and thus it is an aban number.