13440081 has 16 divisors (see below), whose sum is σ = 19588608. Its totient is φ = 8160000.

The previous prime is 13440071. The next prime is 13440083. The reversal of 13440081 is 18004431.

It is not a de Polignac number, because 13440081 - 2¹⁵ = 13407313 is a prime.

It is a super-2 number, since 2×13440081² = 361271554573122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13440083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2670 + ... + 5831.

It is an arithmetic number, because the mean of its divisors is an integer number (1224288).

Almost surely, 2^13440081 is an apocalyptic number.

It is an amenable number.

13440081 is a deficient number, since it is larger than the sum of its proper divisors (6148527).

13440081 is a wasteful number, since it uses less digits than its factorization.

13440081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13440081 is about 3666.0716032287. The cubic root of 13440081 is about 237.7573557462.

The spelling of 13440081 in words is "thirteen million, four hundred forty thousand, eighty-one".