13440040 has 32 divisors (see below), whose sum is σ = 30374280. Its totient is φ = 5352192.

The previous prime is 13440001. The next prime is 13440041. The reversal of 13440040 is 4004431.

It can be written as a sum of positive squares in 4 ways, for example, as 4761124 + 8678916 = 2182^2 + 2946^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13439996 and 13440023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10474 + ... + 11686.

Almost surely, 2^13440040 is an apocalyptic number.

13440040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13440040 is an abundant number, since it is smaller than the sum of its proper divisors (16934240).

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

13440040 is a wasteful number, since it uses less digits than its factorization.

13440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 13440040 is about 3666.0660114079. The cubic root of 13440040 is about 237.7571139802.

Adding to 13440040 its reverse (4004431), we get a palindrome (17444471).

The spelling of 13440040 in words is "thirteen million, four hundred forty thousand, forty".