13705247 has 12 divisors (see below), whose sum is σ = 14883360. Its totient is φ = 12612096.

The previous prime is 13705243. The next prime is 13705249. The reversal of 13705247 is 74250731.

It is not a de Polignac number, because 13705247 - 2² = 13705243 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13705243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13079 + ... + 14087.

It is an arithmetic number, because the mean of its divisors is an integer number (1240280).

Almost surely, 2^13705247 is an apocalyptic number.

13705247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13705247 is a deficient number, since it is larger than the sum of its proper divisors (1178113).

13705247 is a wasteful number, since it uses less digits than its factorization.

13705247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 13705247 is about 3702.0598320395. The cubic root of 13705247 is about 239.3107947022.

Adding to 13705247 its reverse (74250731), we get a palindrome (87955978).

It can be divided in two parts, 137052 and 47, that multiplied together give a square (6441444 = 2538²).

The spelling of 13705247 in words is "thirteen million, seven hundred five thousand, two hundred forty-seven".