13440420 has 72 divisors (see below), whose sum is σ = 46597824. Its totient is φ = 3071808.

The previous prime is 13440419. The next prime is 13440431. The reversal of 13440420 is 2404431.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13440393 and 13440402.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4074 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (647192).

Almost surely, 2^13440420 is an apocalyptic number.

13440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13440420 is an abundant number, since it is smaller than the sum of its proper divisors (33157404).

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

13440420 is a wasteful number, since it uses less digits than its factorization.

13440420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10689 (or 10684 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13440420 is about 3666.1178377133. The cubic root of 13440420 is about 237.7593547189.

Adding to 13440420 its reverse (2404431), we get a palindrome (15844851).

The spelling of 13440420 in words is "thirteen million, four hundred forty thousand, four hundred twenty".