13440432 has 20 divisors (see below), whose sum is σ = 34721240. Its totient is φ = 4480128.

The previous prime is 13440431. The next prime is 13440437. The reversal of 13440432 is 23404431.

It is a junction number, because it is equal to n+sod(n) for n = 13440399 and 13440408.

It is not an unprimeable number, because it can be changed into a prime (13440431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139957 + ... + 140052.

It is an arithmetic number, because the mean of its divisors is an integer number (1736062).

Almost surely, 2^13440432 is an apocalyptic number.

13440432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13440432 is an abundant number, since it is smaller than the sum of its proper divisors (21280808).

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

13440432 is a wasteful number, since it uses less digits than its factorization.

13440432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280020 (or 280014 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 13440432 is about 3666.1194743216. The cubic root of 13440432 is about 237.7594254784.

Adding to 13440432 its reverse (23404431), we get a palindrome (36844863).

The spelling of 13440432 in words is "thirteen million, four hundred forty thousand, four hundred thirty-two".