42155143 has 4 divisors (see below), whose sum is σ = 42168168. Its totient is φ = 42142120.

The previous prime is 42155137. The next prime is 42155147. The reversal of 42155143 is 34155124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42155143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42155147) 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, 2505 + ... + 9517.

It is an arithmetic number, because the mean of its divisors is an integer number (10542042).

Almost surely, 2^42155143 is an apocalyptic number.

42155143 is a deficient number, since it is larger than the sum of its proper divisors (13025).

42155143 is an equidigital number, since it uses as much as digits as its factorization.

42155143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13024.

The product of its digits is 2400, while the sum is 25.

The square root of 42155143 is about 6492.6992075715. The cubic root of 42155143 is about 348.0301395264.

The spelling of 42155143 in words is "forty-two million, one hundred fifty-five thousand, one hundred forty-three".