13946509 has 4 divisors (see below), whose sum is σ = 14082016. Its totient is φ = 13811004.

The previous prime is 13946503. The next prime is 13946531. The reversal of 13946509 is 90564931.

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: 90564931 = 61 ⋅1484671.

It is a cyclic number.

It is not a de Polignac number, because 13946509 - 2³ = 13946501 is a prime.

It is a super-2 number, since 2×13946509² = 389010226574162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13946501) 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, 67599 + ... + 67804.

It is an arithmetic number, because the mean of its divisors is an integer number (3520504).

Almost surely, 2^13946509 is an apocalyptic number.

It is an amenable number.

13946509 is a deficient number, since it is larger than the sum of its proper divisors (135507).

13946509 is a wasteful number, since it uses less digits than its factorization.

13946509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135506.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 13946509 is about 3734.5025103754. The cubic root of 13946509 is about 240.7068800786.

The spelling of 13946509 in words is "thirteen million, nine hundred forty-six thousand, five hundred nine".