13499947 has 4 divisors (see below), whose sum is σ = 13829256. Its totient is φ = 13170640.

The previous prime is 13499939. The next prime is 13499999. The reversal of 13499947 is 74999431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13499947 - 2³ = 13499939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13499897 and 13499906.

It is not an unprimeable number, because it can be changed into a prime (13490947) 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, 164593 + ... + 164674.

It is an arithmetic number, because the mean of its divisors is an integer number (3457314).

Almost surely, 2^13499947 is an apocalyptic number.

13499947 is a deficient number, since it is larger than the sum of its proper divisors (329309).

13499947 is an equidigital number, since it uses as much as digits as its factorization.

13499947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329308.

The product of its digits is 244944, while the sum is 46.

The square root of 13499947 is about 3674.2274017812. The cubic root of 13499947 is about 238.1098461939.

The spelling of 13499947 in words is "thirteen million, four hundred ninety-nine thousand, nine hundred forty-seven".