13123647 has 8 divisors (see below), whose sum is σ = 19442480. Its totient is φ = 8749080.

The previous prime is 13123603. The next prime is 13123679. The reversal of 13123647 is 74632131.

13123647 is a `hidden beast` number, since 1 + 3 + 12 + 3 + 647 = 666.

It is not a de Polignac number, because 13123647 - 2⁸ = 13123391 is a prime.

It is a super-2 number, since 2×13123647² = 344460221161218, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 486061 = 13123647 / (1 + 3 + 1 + 2 + 3 + 6 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13123647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123687) 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, 243004 + ... + 243057.

It is an arithmetic number, because the mean of its divisors is an integer number (2430310).

Almost surely, 2^13123647 is an apocalyptic number.

13123647 is a deficient number, since it is larger than the sum of its proper divisors (6318833).

13123647 is an equidigital number, since it uses as much as digits as its factorization.

13123647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486070 (or 486064 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 13123647 is about 3622.6574499944. The cubic root of 13123647 is about 235.8765932897.

Adding to 13123647 its reverse (74632131), we get a palindrome (87755778).

The spelling of 13123647 in words is "thirteen million, one hundred twenty-three thousand, six hundred forty-seven".