18131347 has 8 divisors (see below), whose sum is σ = 19746720. Its totient is φ = 16547520.

The previous prime is 18131303. The next prime is 18131359. The reversal of 18131347 is 74313181.

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

It is a cyclic number.

It is not a de Polignac number, because 18131347 - 2⁷ = 18131219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18131647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6679 + ... + 8992.

It is an arithmetic number, because the mean of its divisors is an integer number (2468340).

Almost surely, 2^18131347 is an apocalyptic number.

18131347 is a deficient number, since it is larger than the sum of its proper divisors (1615373).

18131347 is a wasteful number, since it uses less digits than its factorization.

18131347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15773.

The product of its digits is 2016, while the sum is 28.

The square root of 18131347 is about 4258.0919435822. The cubic root of 18131347 is about 262.7100516760.

It can be divided in two parts, 1813 and 1347, that added together give a triangular number (3160 = T₇₉).

The spelling of 18131347 in words is "eighteen million, one hundred thirty-one thousand, three hundred forty-seven".