18047977 has 4 divisors (see below), whose sum is σ = 18067536. Its totient is φ = 18028420.

The previous prime is 18047963. The next prime is 18047989. The reversal of 18047977 is 77974081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18047977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18047957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8323 + ... + 10264.

It is an arithmetic number, because the mean of its divisors is an integer number (4516884).

Almost surely, 2^18047977 is an apocalyptic number.

It is an amenable number.

18047977 is a deficient number, since it is larger than the sum of its proper divisors (19559).

18047977 is an equidigital number, since it uses as much as digits as its factorization.

18047977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19558.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 18047977 is about 4248.2910681826. The cubic root of 18047977 is about 262.3067760206.

The spelling of 18047977 in words is "eighteen million, forty-seven thousand, nine hundred seventy-seven".