12515240 has 32 divisors (see below), whose sum is σ = 29133000. Its totient is φ = 4833024.

The previous prime is 12515203. The next prime is 12515311. The reversal of 12515240 is 4251521.

It can be written as a sum of positive squares in 4 ways, for example, as 9897316 + 2617924 = 3146^2 + 1618^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4235 + ... + 6554.

Almost surely, 2^12515240 is an apocalyptic number.

12515240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12515240 is an abundant number, since it is smaller than the sum of its proper divisors (16617760).

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

12515240 is a wasteful number, since it uses less digits than its factorization.

12515240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10829 (or 10825 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 12515240 is about 3537.6885108783. The cubic root of 12515240 is about 232.1737204612.

Adding to 12515240 its reverse (4251521), we get a palindrome (16766761).

The spelling of 12515240 in words is "twelve million, five hundred fifteen thousand, two hundred forty".