18078671 has 16 divisors (see below), whose sum is σ = 20895840. Its totient is φ = 15500160.

The previous prime is 18078649. The next prime is 18078719. The reversal of 18078671 is 17687081.

It is not a de Polignac number, because 18078671 - 2¹⁴ = 18062287 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 (18071671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12401 + ... + 13781.

It is an arithmetic number, because the mean of its divisors is an integer number (1305990).

Almost surely, 2^18078671 is an apocalyptic number.

18078671 is a deficient number, since it is larger than the sum of its proper divisors (2817169).

18078671 is a wasteful number, since it uses less digits than its factorization.

18078671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 18078671 is about 4251.9020449676. The cubic root of 18078671 is about 262.4553925713.

The spelling of 18078671 in words is "eighteen million, seventy-eight thousand, six hundred seventy-one".