18478071 has 8 divisors (see below), whose sum is σ = 27374960. Its totient is φ = 12318696.

The previous prime is 18478069. The next prime is 18478073. The reversal of 18478071 is 17087481.

It is an interprime number because it is at equal distance from previous prime (18478069) and next prime (18478073).

It is not a de Polignac number, because 18478071 - 2¹ = 18478069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18478073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342160 + ... + 342213.

It is an arithmetic number, because the mean of its divisors is an integer number (3421870).

Almost surely, 2^18478071 is an apocalyptic number.

18478071 is a deficient number, since it is larger than the sum of its proper divisors (8896889).

18478071 is an equidigital number, since it uses as much as digits as its factorization.

18478071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684382 (or 684376 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 18478071 is about 4298.6126831805. The cubic root of 18478071 is about 264.3740822864.

The spelling of 18478071 in words is "eighteen million, four hundred seventy-eight thousand, seventy-one".