18120347 has 10 divisors (see below), whose sum is σ = 21141948. Its totient is φ = 15529668.

The previous prime is 18120307. The next prime is 18120353. The reversal of 18120347 is 74302181.

It is not a de Polignac number, because 18120347 - 2¹⁰ = 18119323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18120307) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1373 + ... + 6174.

Almost surely, 2^18120347 is an apocalyptic number.

18120347 is a deficient number, since it is larger than the sum of its proper divisors (3021601).

18120347 is an frugal number, since it uses more digits than its factorization.

18120347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7575 (or 7554 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18120347 is about 4256.8000892689. The cubic root of 18120347 is about 262.6569135911.

The spelling of 18120347 in words is "eighteen million, one hundred twenty thousand, three hundred forty-seven".