30155120 has 40 divisors (see below), whose sum is σ = 71111520. Its totient is φ = 11889920.

The previous prime is 30155119. The next prime is 30155123. The reversal of 30155120 is 2155103.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30155123) 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, 3026 + ... + 8334.

It is an arithmetic number, because the mean of its divisors is an integer number (1777788).

Almost surely, 2^30155120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30155120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35555760).

30155120 is an abundant number, since it is smaller than the sum of its proper divisors (40956400).

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

30155120 is a wasteful number, since it uses less digits than its factorization.

30155120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5393 (or 5387 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 30155120 is about 5491.3677713298. The cubic root of 30155120 is about 311.2578789745.

Subtracting from 30155120 its sum of digits (17), we obtain a palindrome (30155103).

The spelling of 30155120 in words is "thirty million, one hundred fifty-five thousand, one hundred twenty".