13791215 has 4 divisors (see below), whose sum is σ = 16549464. Its totient is φ = 11032968.

The previous prime is 13791209. The next prime is 13791221. The reversal of 13791215 is 51219731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51219731 = 6011 ⋅8521.

It is an interprime number because it is at equal distance from previous prime (13791209) and next prime (13791221).

It is a cyclic number.

It is not a de Polignac number, because 13791215 - 2¹⁸ = 13529071 is a prime.

It is a super-2 number, since 2×13791215² = 380395222352450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1379117 + ... + 1379126.

It is an arithmetic number, because the mean of its divisors is an integer number (4137366).

Almost surely, 2^13791215 is an apocalyptic number.

13791215 is a deficient number, since it is larger than the sum of its proper divisors (2758249).

13791215 is an equidigital number, since it uses as much as digits as its factorization.

13791215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758248.

The product of its digits is 1890, while the sum is 29.

The square root of 13791215 is about 3713.6525147084. The cubic root of 13791215 is about 239.8101218065.

The spelling of 13791215 in words is "thirteen million, seven hundred ninety-one thousand, two hundred fifteen".