15530240 has 72 divisors (see below), whose sum is σ = 40618368. Its totient is φ = 5642240.

The previous prime is 15530227. The next prime is 15530261. The reversal of 15530240 is 4203551.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13529 + ... + 14631.

It is an arithmetic number, because the mean of its divisors is an integer number (564144).

Almost surely, 2^15530240 is an apocalyptic number.

15530240 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 15530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20309184).

15530240 is an abundant number, since it is smaller than the sum of its proper divisors (25088128).

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

15530240 is a wasteful number, since it uses less digits than its factorization.

15530240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 15530240 is about 3940.8425495064. The cubic root of 15530240 is about 249.4935882144.

Adding to 15530240 its reverse (4203551), we get a palindrome (19733791).

The spelling of 15530240 in words is "fifteen million, five hundred thirty thousand, two hundred forty".