13909215 has 16 divisors (see below), whose sum is σ = 22477536. Its totient is φ = 7344000.

The previous prime is 13909211. The next prime is 13909237. The reversal of 13909215 is 51290931.

It is not a de Polignac number, because 13909215 - 2² = 13909211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13909211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3076 + ... + 6105.

It is an arithmetic number, because the mean of its divisors is an integer number (1404846).

It is the magic constant of a 303 × 303 magic square.

Almost surely, 2^13909215 is an apocalyptic number.

13909215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13909215 is a deficient number, since it is larger than the sum of its proper divisors (8568321).

13909215 is a wasteful number, since it uses less digits than its factorization.

13909215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9290.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 13909215 is about 3729.5059994589. The cubic root of 13909215 is about 240.4921325279.

The spelling of 13909215 in words is "thirteen million, nine hundred nine thousand, two hundred fifteen".