13218140 has 24 divisors (see below), whose sum is σ = 29893920. Its totient is φ = 4880448.

The previous prime is 13218131. The next prime is 13218181. The reversal of 13218140 is 4181231.

13218140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25160 + ... + 25679.

It is an arithmetic number, because the mean of its divisors is an integer number (1245580).

Almost surely, 2^13218140 is an apocalyptic number.

13218140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13218140 is an abundant number, since it is smaller than the sum of its proper divisors (16675780).

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

13218140 is a wasteful number, since it uses less digits than its factorization.

13218140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50861 (or 50859 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 13218140 is about 3635.6760031664. The cubic root of 13218140 is about 236.4413602200.

Adding to 13218140 its reverse (4181231), we get a palindrome (17399371).

The spelling of 13218140 in words is "thirteen million, two hundred eighteen thousand, one hundred forty".