42505155 has 160 divisors (see below), whose sum is σ = 100362240. Its totient is φ = 16692480.

The previous prime is 42505121. The next prime is 42505157. The reversal of 42505155 is 55150524.

42505155 is a `hidden beast` number, since 4 + 2 + 505 + 155 = 666.

It is not a de Polignac number, because 42505155 - 2¹² = 42501059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42505157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 904342 + ... + 904388.

It is an arithmetic number, because the mean of its divisors is an integer number (627264).

Almost surely, 2^42505155 is an apocalyptic number.

42505155 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42505155 is an abundant number, since it is smaller than the sum of its proper divisors (57857085).

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

42505155 is a wasteful number, since it uses less digits than its factorization.

42505155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 102 counting only the distinct ones).

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

The square root of 42505155 is about 6519.5977636661. The cubic root of 42505155 is about 348.9907113780.

Adding to 42505155 its reverse (55150524), we get a palindrome (97655679).

The spelling of 42505155 in words is "forty-two million, five hundred five thousand, one hundred fifty-five".