13437909 has 6 divisors (see below), whose sum is σ = 19410326. Its totient is φ = 8958600.

The previous prime is 13437901. The next prime is 13437917. The reversal of 13437909 is 90973431.

It is an interprime number because it is at equal distance from previous prime (13437901) and next prime (13437917).

It can be written as a sum of positive squares in only one way, i.e., 10909809 + 2528100 = 3303^2 + 1590^2 .

It is not a de Polignac number, because 13437909 - 2³ = 13437901 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 (13437901) 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 5 ways as a sum of consecutive naturals, for example, 746542 + ... + 746559.

Almost surely, 2^13437909 is an apocalyptic number.

It is an amenable number.

13437909 is a deficient number, since it is larger than the sum of its proper divisors (5972417).

13437909 is a wasteful number, since it uses less digits than its factorization.

13437909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493107 (or 1493104 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 13437909 is about 3665.7753613663. The cubic root of 13437909 is about 237.7445473710.

The spelling of 13437909 in words is "thirteen million, four hundred thirty-seven thousand, nine hundred nine".