13440025 has 12 divisors (see below), whose sum is σ = 16711852. Its totient is φ = 10722240.

The previous prime is 13440001. The next prime is 13440041. The reversal of 13440025 is 52004431.

It can be written as a sum of positive squares in 6 ways, for example, as 1308736 + 12131289 = 1144^2 + 3483^2 .

It is not a de Polignac number, because 13440025 - 2¹⁵ = 13407257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13439984 and 13440011.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14887 + ... + 15763.

Almost surely, 2^13440025 is an apocalyptic number.

It is an amenable number.

13440025 is a deficient number, since it is larger than the sum of its proper divisors (3271827).

13440025 is an equidigital number, since it uses as much as digits as its factorization.

13440025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500 (or 1495 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 13440025 is about 3666.0639656176. The cubic root of 13440025 is about 237.7570255291.

Adding to 13440025 its reverse (52004431), we get a palindrome (65444456).

The spelling of 13440025 in words is "thirteen million, four hundred forty thousand, twenty-five".