18071766 has 24 divisors (see below), whose sum is σ = 39237744. Its totient is φ = 6011280.

The previous prime is 18071761. The next prime is 18071771. The reversal of 18071766 is 66717081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18071761) and next prime (18071771).

It is a self number, because there is not a number n which added to its sum of digits gives 18071766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071761) 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 11 ways as a sum of consecutive naturals, for example, 12396 + ... + 13776.

It is an arithmetic number, because the mean of its divisors is an integer number (1634906).

Almost surely, 2^18071766 is an apocalyptic number.

18071766 is an abundant number, since it is smaller than the sum of its proper divisors (21165978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18071766 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (18071765) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (2116).

18071766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116 (or 2113 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 18071766 is about 4251.0899778763. The cubic root of 18071766 is about 262.4219740887.

The spelling of 18071766 in words is "eighteen million, seventy-one thousand, seven hundred sixty-six".