155138120 has 32 divisors (see below), whose sum is σ = 351820800. Its totient is φ = 61564608.

The previous prime is 155138119. The next prime is 155138129. The reversal of 155138120 is 21831551.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 155138120.

It is not an unprimeable number, because it can be changed into a prime (155138129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10190 + ... + 20349.

It is an arithmetic number, because the mean of its divisors is an integer number (10994400).

Almost surely, 2^155138120 is an apocalyptic number.

155138120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155138120 is an abundant number, since it is smaller than the sum of its proper divisors (196682680).

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

155138120 is a wasteful number, since it uses less digits than its factorization.

155138120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30677 (or 30673 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 155138120 is about 12455.4453954887. The cubic root of 155138120 is about 537.3280445076.

Adding to 155138120 its reverse (21831551), we get a palindrome (176969671).

The spelling of 155138120 in words is "one hundred fifty-five million, one hundred thirty-eight thousand, one hundred twenty".