13920109 has 4 divisors (see below), whose sum is σ = 15908704. Its totient is φ = 11931516.

The previous prime is 13920061. The next prime is 13920113. The reversal of 13920109 is 90102931.

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.

It is a cyclic number.

It is not a de Polignac number, because 13920109 - 2⁷ = 13919981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13920149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994287 + ... + 994300.

It is an arithmetic number, because the mean of its divisors is an integer number (3977176).

Almost surely, 2^13920109 is an apocalyptic number.

It is an amenable number.

13920109 is a deficient number, since it is larger than the sum of its proper divisors (1988595).

13920109 is an equidigital number, since it uses as much as digits as its factorization.

13920109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988594.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 13920109 is about 3730.9662287402. The cubic root of 13920109 is about 240.5549023678.

The spelling of 13920109 in words is "thirteen million, nine hundred twenty thousand, one hundred nine".