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1788 = 223149

1788 has 12 divisors (see below), whose sum is σ = 4200. Its totient is φ = 592.

The previous prime is 1787. The next prime is 1789. The reversal of 1788 is 8871.

It is an interprime number because it is at equal distance from previous prime (1787) and next prime (1789).

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 10.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63 + ... + 86.

It is an arithmetic number, because the mean of its divisors is an integer number (350).

It is an amenable number.

1788 is an abundant number, since it is smaller than the sum of its proper divisors (2412).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100).

1788 is a wasteful number, since it uses less digits than its factorization.

1788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 154 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 1788 is about 42.2847490237. The cubic root of 1788 is about 12.1373116877.

Subtracting from 1788 its sum of digits (24), we obtain a square (1764 = 422).

It can be divided in two parts, 17 and 88, that added together give a triangular number (105 = T14).

The spelling of 1788 in words is "one thousand, seven hundred eighty-eight".

Divisors: 1 2 3 4 6 12 149 298 447 596 894 1788