155403540 has 72 divisors (see below), whose sum is σ = 472785768. Its totient is φ = 41318400.

The previous prime is 155403517. The next prime is 155403541. The reversal of 155403540 is 45304551.

155403540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 24621444 + 130782096 = 4962^2 + 11436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155403541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71104 + ... + 73256.

It is an arithmetic number, because the mean of its divisors is an integer number (6566469).

Almost surely, 2^155403540 is an apocalyptic number.

155403540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155403540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236392884).

155403540 is an abundant number, since it is smaller than the sum of its proper divisors (317382228).

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

155403540 is a wasteful number, since it uses less digits than its factorization.

155403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 155403540 is about 12466.0956197199. The cubic root of 155403540 is about 537.6343013961.

The spelling of 155403540 in words is "one hundred fifty-five million, four hundred three thousand, five hundred forty".