155222000 has 40 divisors (see below), whose sum is σ = 375331632. Its totient is φ = 62088000.

The previous prime is 155221999. The next prime is 155222027. The reversal of 155222000 is 222551.

155222000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 155222000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36806 + ... + 40805.

Almost surely, 2^155222000 is an apocalyptic number.

155222000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155222000 is an abundant number, since it is smaller than the sum of its proper divisors (220109632).

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

155222000 is an equidigital number, since it uses as much as digits as its factorization.

155222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77634 (or 77618 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 155222000 is about 12458.8121424155. The cubic root of 155222000 is about 537.4248678111.

Adding to 155222000 its reverse (222551), we get a palindrome (155444551).

The spelling of 155222000 in words is "one hundred fifty-five million, two hundred twenty-two thousand".