155203120 has 40 divisors (see below), whose sum is σ = 363039264. Its totient is φ = 61704192.

The previous prime is 155203109. The next prime is 155203129. The reversal of 155203120 is 21302551.

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

It is not an unprimeable number, because it can be changed into a prime (155203129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7552 + ... + 19168.

Almost surely, 2^155203120 is an apocalyptic number.

155203120 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 155203120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181519632).

155203120 is an abundant number, since it is smaller than the sum of its proper divisors (207836144).

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

155203120 is a wasteful number, since it uses less digits than its factorization.

155203120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11797 (or 11791 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 155203120 is about 12458.0544227419. The cubic root of 155203120 is about 537.4030775302.

Adding to 155203120 its reverse (21302551), we get a palindrome (176505671).

The spelling of 155203120 in words is "one hundred fifty-five million, two hundred three thousand, one hundred twenty".