13215445 has 8 divisors (see below), whose sum is σ = 16405560. Its totient is φ = 10207680.

The previous prime is 13215439. The next prime is 13215457. The reversal of 13215445 is 54451231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 154449 + 13060996 = 393^2 + 3614^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-13215445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45426 + ... + 45715.

It is an arithmetic number, because the mean of its divisors is an integer number (2050695).

Almost surely, 2^13215445 is an apocalyptic number.

It is an amenable number.

13215445 is a deficient number, since it is larger than the sum of its proper divisors (3190115).

13215445 is an equidigital number, since it uses as much as digits as its factorization.

13215445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91175.

The product of its digits is 2400, while the sum is 25.

The square root of 13215445 is about 3635.3053516864. The cubic root of 13215445 is about 236.4252900625.

Adding to 13215445 its reverse (54451231), we get a palindrome (67666676).

The spelling of 13215445 in words is "thirteen million, two hundred fifteen thousand, four hundred forty-five".