13479309 has 6 divisors (see below), whose sum is σ = 19470126. Its totient is φ = 8986200.

The previous prime is 13479299. The next prime is 13479329. The reversal of 13479309 is 90397431.

13479309 is a `hidden beast` number, since 1 + 347 + 9 + 309 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 2490084 = 3315^2 + 1578^2 .

It is not a de Polignac number, because 13479309 - 2⁹ = 13478797 is a prime.

It is a super-2 number, since 2×13479309² = 363383542234962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13479329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 748842 + ... + 748859.

It is an arithmetic number, because the mean of its divisors is an integer number (3245021).

Almost surely, 2^13479309 is an apocalyptic number.

It is an amenable number.

13479309 is a deficient number, since it is larger than the sum of its proper divisors (5990817).

13479309 is a wasteful number, since it uses less digits than its factorization.

13479309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497707 (or 1497704 counting only the distinct ones).

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

The square root of 13479309 is about 3671.4178460099. The cubic root of 13479309 is about 237.9884477598.

The spelling of 13479309 in words is "thirteen million, four hundred seventy-nine thousand, three hundred nine".