155805222 has 32 divisors (see below), whose sum is σ = 317030400. Its totient is φ = 51038208.

The previous prime is 155805179. The next prime is 155805229. The reversal of 155805222 is 222508551.

It is a self number, because there is not a number n which added to its sum of digits gives 155805222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155805229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121179 + ... + 122457.

It is an arithmetic number, because the mean of its divisors is an integer number (9907200).

Almost surely, 2^155805222 is an apocalyptic number.

155805222 is an abundant number, since it is smaller than the sum of its proper divisors (161225178).

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

155805222 is a wasteful number, since it uses less digits than its factorization.

155805222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 155805222 is about 12482.1962009896. The cubic root of 155805222 is about 538.0971227301.

It can be divided in two parts, 15580 and 5222, that added together give a palindrome (20802).

The spelling of 155805222 in words is "one hundred fifty-five million, eight hundred five thousand, two hundred twenty-two".