13211440 has 40 divisors (see below), whose sum is σ = 33511248. Its totient is φ = 4803840.

The previous prime is 13211437. The next prime is 13211477. The reversal of 13211440 is 4411231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a nialpdrome in base 16.

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 7 ways as a sum of consecutive naturals, for example, 6627 + ... + 8386.

Almost surely, 2^13211440 is an apocalyptic number.

13211440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13211440 is an abundant number, since it is smaller than the sum of its proper divisors (20299808).

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

13211440 is a wasteful number, since it uses less digits than its factorization.

13211440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15037 (or 15031 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 13211440 is about 3634.7544621336. The cubic root of 13211440 is about 236.4014044005.

Adding to 13211440 its reverse (4411231), we get a palindrome (17622671).

The spelling of 13211440 in words is "thirteen million, two hundred eleven thousand, four hundred forty".