13451440 has 20 divisors (see below), whose sum is σ = 31274784. Its totient is φ = 5380544.

The previous prime is 13451429. The next prime is 13451441. The reversal of 13451440 is 4415431.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (13451441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83992 + ... + 84151.

Almost surely, 2^13451440 is an apocalyptic number.

13451440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13451440 is an abundant number, since it is smaller than the sum of its proper divisors (17823344).

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

13451440 is a wasteful number, since it uses less digits than its factorization.

13451440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168156 (or 168150 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 13451440 is about 3667.6204820019. The cubic root of 13451440 is about 237.8243177762.

Adding to 13451440 its reverse (4415431), we get a palindrome (17866871).

The spelling of 13451440 in words is "thirteen million, four hundred fifty-one thousand, four hundred forty".