155540144 has 20 divisors (see below), whose sum is σ = 311081280. Its totient is φ = 75261120.

The previous prime is 155540141. The next prime is 155540149. The reversal of 155540144 is 441045551.

155540144 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (155540141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156299 + ... + 157290.

It is an arithmetic number, because the mean of its divisors is an integer number (15554064).

Almost surely, 2^155540144 is an apocalyptic number.

It is an amenable number.

155540144 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

155540144 is a wasteful number, since it uses less digits than its factorization.

155540144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313628 (or 313622 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 155540144 is about 12471.5734372211. The cubic root of 155540144 is about 537.7917870560.

Adding to 155540144 its reverse (441045551), we get a palindrome (596585695).

The spelling of 155540144 in words is "one hundred fifty-five million, five hundred forty thousand, one hundred forty-four".