15252440 has 128 divisors (see below), whose sum is σ = 42854400. Its totient is φ = 4769280.

The previous prime is 15252439. The next prime is 15252449. The reversal of 15252440 is 4425251.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15252449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 250010 + ... + 250070.

It is an arithmetic number, because the mean of its divisors is an integer number (334800).

Almost surely, 2^15252440 is an apocalyptic number.

15252440 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 15252440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21427200).

15252440 is an abundant number, since it is smaller than the sum of its proper divisors (27601960).

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

15252440 is a wasteful number, since it uses less digits than its factorization.

15252440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 15252440 is about 3905.4372354450. The cubic root of 15252440 is about 247.9970082886.

Adding to 15252440 its reverse (4425251), we get a palindrome (19677691).

The spelling of 15252440 in words is "fifteen million, two hundred fifty-two thousand, four hundred forty".