13009947 has 8 divisors (see below), whose sum is σ = 18367056. Its totient is φ = 8163072.

The previous prime is 13009943. The next prime is 13009949. The reversal of 13009947 is 74990031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13009947 - 2² = 13009943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13009943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127498 + ... + 127599.

It is an arithmetic number, because the mean of its divisors is an integer number (2295882).

Almost surely, 2^13009947 is an apocalyptic number.

13009947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13009947 is a deficient number, since it is larger than the sum of its proper divisors (5357109).

13009947 is a wasteful number, since it uses less digits than its factorization.

13009947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255117.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 13009947 is about 3606.9304124144. The cubic root of 13009947 is about 235.1934245755.

Adding to 13009947 its reverse (74990031), we get a palindrome (87999978).

The spelling of 13009947 in words is "thirteen million, nine thousand, nine hundred forty-seven".