15550240 has 48 divisors (see below), whose sum is σ = 38905272. Its totient is φ = 5853184.

The previous prime is 15550229. The next prime is 15550289. The reversal of 15550240 is 4205551.

It can be written as a sum of positive squares in 4 ways, for example, as 14409616 + 1140624 = 3796^2 + 1068^2 .

It is a congruent number.

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, 139 + ... + 5578.

Almost surely, 2^15550240 is an apocalyptic number.

15550240 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 15550240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19452636).

15550240 is an abundant number, since it is smaller than the sum of its proper divisors (23355032).

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

15550240 is a wasteful number, since it uses less digits than its factorization.

15550240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749 (or 5741 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 15550240 is about 3943.3792614964. The cubic root of 15550240 is about 249.6006423937.

Adding to 15550240 its reverse (4205551), we get a palindrome (19755791).

The spelling of 15550240 in words is "fifteen million, five hundred fifty thousand, two hundred forty".