42155771 has 8 divisors (see below), whose sum is σ = 48219360. Its totient is φ = 36102528.

The previous prime is 42155761. The next prime is 42155807. The reversal of 42155771 is 17755124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-42155771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42155741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10745 + ... + 14133.

It is an arithmetic number, because the mean of its divisors is an integer number (6027420).

Almost surely, 2^42155771 is an apocalyptic number.

42155771 is a deficient number, since it is larger than the sum of its proper divisors (6063589).

42155771 is a wasteful number, since it uses less digits than its factorization.

42155771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173.

The product of its digits is 9800, while the sum is 32.

The square root of 42155771 is about 6492.7475694039. The cubic root of 42155771 is about 348.0318677603.

The spelling of 42155771 in words is "forty-two million, one hundred fifty-five thousand, seven hundred seventy-one".