155532240 has 120 divisors (see below), whose sum is σ = 524696328. Its totient is φ = 41287680.

The previous prime is 155532227. The next prime is 155532241. The reversal of 155532240 is 42235551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27751824 + 127780416 = 5268^2 + 11304^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155532241) 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 23 ways as a sum of consecutive naturals, for example, 242320 + ... + 242960.

Almost surely, 2^155532240 is an apocalyptic number.

155532240 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 155532240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262348164).

155532240 is an abundant number, since it is smaller than the sum of its proper divisors (369164088).

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

155532240 is a wasteful number, since it uses less digits than its factorization.

155532240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 988 counting only the distinct ones).

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

The square root of 155532240 is about 12471.2565525692. The cubic root of 155532240 is about 537.7826773428.

Adding to 155532240 its reverse (42235551), we get a palindrome (197767791).

The spelling of 155532240 in words is "one hundred fifty-five million, five hundred thirty-two thousand, two hundred forty".