13809761 has 4 divisors (see below), whose sum is σ = 15782592. Its totient is φ = 11836932.

The previous prime is 13809749. The next prime is 13809773. The reversal of 13809761 is 16790831.

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: 16790831 = 733 ⋅22907.

It is an interprime number because it is at equal distance from previous prime (13809749) and next prime (13809773).

It is a cyclic number.

It is not a de Polignac number, because 13809761 - 2¹⁸ = 13547617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13809791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986405 + ... + 986418.

It is an arithmetic number, because the mean of its divisors is an integer number (3945648).

Almost surely, 2^13809761 is an apocalyptic number.

It is an amenable number.

13809761 is a deficient number, since it is larger than the sum of its proper divisors (1972831).

13809761 is an equidigital number, since it uses as much as digits as its factorization.

13809761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972830.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 13809761 is about 3716.1486784035. The cubic root of 13809761 is about 239.9175700716.

The spelling of 13809761 in words is "thirteen million, eight hundred nine thousand, seven hundred sixty-one".