155540120 has 16 divisors (see below), whose sum is σ = 349965360. Its totient is φ = 62216032.

The previous prime is 155540087. The next prime is 155540141. The reversal of 155540120 is 21045551.

It is a happy number.

155540120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155540120² = 48385457859228800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1944212 + ... + 1944291.

It is an arithmetic number, because the mean of its divisors is an integer number (21872835).

Almost surely, 2^155540120 is an apocalyptic number.

155540120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155540120 is an abundant number, since it is smaller than the sum of its proper divisors (194425240).

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

155540120 is a wasteful number, since it uses less digits than its factorization.

155540120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888514 (or 3888510 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 155540120 is about 12471.5724750330. The cubic root of 155540120 is about 537.7917593954.

Adding to 155540120 its reverse (21045551), we get a palindrome (176585671).

The spelling of 155540120 in words is "one hundred fifty-five million, five hundred forty thousand, one hundred twenty".