13215140 has 12 divisors (see below), whose sum is σ = 27751836. Its totient is φ = 5286048.

The previous prime is 13215121. The next prime is 13215151. The reversal of 13215140 is 4151231.

It can be written as a sum of positive squares in 2 ways, for example, as 4227136 + 8988004 = 2056^2 + 2998^2 .

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 3 ways as a sum of consecutive naturals, for example, 330359 + ... + 330398.

It is an arithmetic number, because the mean of its divisors is an integer number (2312653).

Almost surely, 2^13215140 is an apocalyptic number.

13215140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13215140 is an abundant number, since it is smaller than the sum of its proper divisors (14536696).

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

13215140 is a wasteful number, since it uses less digits than its factorization.

13215140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660766 (or 660764 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 13215140 is about 3635.2634017358. The cubic root of 13215140 is about 236.4234712243.

Adding to 13215140 its reverse (4151231), we get a palindrome (17366371).

The spelling of 13215140 in words is "thirteen million, two hundred fifteen thousand, one hundred forty".