42155550 has 72 divisors (see below), whose sum is σ = 118211184. Its totient is φ = 10750080.

The previous prime is 42155513. The next prime is 42155551. The reversal of 42155550 is 5555124.

42155550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42155551) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 8314 + ... + 12386.

It is an arithmetic number, because the mean of its divisors is an integer number (1641822).

Almost surely, 2^42155550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42155550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59105592).

42155550 is an abundant number, since it is smaller than the sum of its proper divisors (76055634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42155550 is a wasteful number, since it uses less digits than its factorization.

42155550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114 (or 4106 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 42155550 is about 6492.7305503925. The cubic root of 42155550 is about 348.0312595780.

The spelling of 42155550 in words is "forty-two million, one hundred fifty-five thousand, five hundred fifty".