15240240 has 120 divisors (see below), whose sum is σ = 52170768. Its totient is φ = 3985920.

The previous prime is 15240229. The next prime is 15240257. The reversal of 15240240 is 4204251.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43747 + ... + 44093.

Almost surely, 2^15240240 is an apocalyptic number.

15240240 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 15240240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26085384).

15240240 is an abundant number, since it is smaller than the sum of its proper divisors (36930528).

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

15240240 is a wasteful number, since it uses less digits than its factorization.

15240240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 15240240 is about 3903.8749979988. The cubic root of 15240240 is about 247.9308686950.

Adding to 15240240 its reverse (4204251), we get a palindrome (19444491).

The spelling of 15240240 in words is "fifteen million, two hundred forty thousand, two hundred forty".