13321840 has 40 divisors (see below), whose sum is σ = 35399520. Its totient is φ = 4567296.

The previous prime is 13321837. The next prime is 13321877. The reversal of 13321840 is 4812331.

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

It is a congruent number.

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, 11335 + ... + 12454.

It is an arithmetic number, because the mean of its divisors is an integer number (884988).

Almost surely, 2^13321840 is an apocalyptic number.

13321840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13321840 is an abundant number, since it is smaller than the sum of its proper divisors (22077680).

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

13321840 is a wasteful number, since it uses less digits than its factorization.

13321840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23809 (or 23803 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 13321840 is about 3649.9095879213. The cubic root of 13321840 is about 237.0580664454.

It can be divided in two parts, 13321 and 840, that added together give a square (14161 = 119²).

The spelling of 13321840 in words is "thirteen million, three hundred twenty-one thousand, eight hundred forty".