15224240 has 40 divisors (see below), whose sum is σ = 36158400. Its totient is φ = 5958656.

The previous prime is 15224239. The next prime is 15224249. The reversal of 15224240 is 4242251.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is not an unprimeable number, because it can be changed into a prime (15224249) by changing a digit.

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, 1736 + ... + 5784.

It is an arithmetic number, because the mean of its divisors is an integer number (903960).

Almost surely, 2^15224240 is an apocalyptic number.

15224240 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 15224240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18079200).

15224240 is an abundant number, since it is smaller than the sum of its proper divisors (20934160).

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

15224240 is a wasteful number, since it uses less digits than its factorization.

15224240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 15224240 is about 3901.8252139223. The cubic root of 15224240 is about 247.8440747222.

Adding to 15224240 its reverse (4242251), we get a palindrome (19466491).

The spelling of 15224240 in words is "fifteen million, two hundred twenty-four thousand, two hundred forty".