155122120 has 64 divisors (see below), whose sum is σ = 367960320. Its totient is φ = 58738944.

The previous prime is 155122117. The next prime is 155122129. The reversal of 155122120 is 21221551.

It is a super-2 number, since 2×155122120² = 48125744226588800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155122129) 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, 93942 + ... + 95578.

It is an arithmetic number, because the mean of its divisors is an integer number (5749380).

Almost surely, 2^155122120 is an apocalyptic number.

155122120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155122120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183980160).

155122120 is an abundant number, since it is smaller than the sum of its proper divisors (212838200).

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

155122120 is a wasteful number, since it uses less digits than its factorization.

155122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774 (or 1770 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 155122120 is about 12454.8030895715. The cubic root of 155122120 is about 537.3095716262.

Adding to 155122120 its reverse (21221551), we get a palindrome (176343671).

The spelling of 155122120 in words is "one hundred fifty-five million, one hundred twenty-two thousand, one hundred twenty".