13913909 has 4 divisors (see below), whose sum is σ = 14646240. Its totient is φ = 13181580.

The previous prime is 13913899. The next prime is 13913923. The reversal of 13913909 is 90931931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90931931 = 67 ⋅1357193.

It is a cyclic number.

It is not a de Polignac number, because 13913909 - 2¹² = 13909813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13913929) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 366137 + ... + 366174.

It is an arithmetic number, because the mean of its divisors is an integer number (3661560).

Almost surely, 2^13913909 is an apocalyptic number.

13913909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13913909 is a deficient number, since it is larger than the sum of its proper divisors (732331).

13913909 is an equidigital number, since it uses as much as digits as its factorization.

13913909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732330.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 13913909 is about 3730.1352522395. The cubic root of 13913909 is about 240.5191827749.

It can be divided in two parts, 1391390 and 9, that multiplied together give a triangular number (12522510 = T₅₀₀₄).

The spelling of 13913909 in words is "thirteen million, nine hundred thirteen thousand, nine hundred nine".