155021140 has 24 divisors (see below), whose sum is σ = 327892320. Its totient is φ = 61561248.

The previous prime is 155021107. The next prime is 155021159. The reversal of 155021140 is 41120551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25102 + ... + 30661.

It is an arithmetic number, because the mean of its divisors is an integer number (13662180).

Almost surely, 2^155021140 is an apocalyptic number.

155021140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155021140 is an abundant number, since it is smaller than the sum of its proper divisors (172871180).

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

155021140 is a wasteful number, since it uses less digits than its factorization.

155021140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55911 (or 55909 counting only the distinct ones).

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

The square root of 155021140 is about 12450.7485718731. The cubic root of 155021140 is about 537.1929553367.

Adding to 155021140 its reverse (41120551), we get a palindrome (196141691).

The spelling of 155021140 in words is "one hundred fifty-five million, twenty-one thousand, one hundred forty".