1778 has 8 divisors (see below), whose sum is σ = 3072. Its totient is φ = 756.

The previous prime is 1777. The next prime is 1783. The reversal of 1778 is 8771.

1778 is nontrivially palindromic in base 13.

1778 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1778² = 6322568, which contains 22 as substring.

1778 is an undulating number in base 13.

1778 is strictly pandigital in base 5.

It is a Curzon number.

It is a plaindrome in base 10 and base 11.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 77.

It is an arithmetic number, because the mean of its divisors is an integer number (384).

1778 is a deficient number, since it is larger than the sum of its proper divisors (1294).

1778 is a wasteful number, since it uses less digits than its factorization.

1778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136.

The product of its digits is 392, while the sum is 23.

The square root of 1778 is about 42.1663372846. The cubic root of 1778 is about 12.1146420202.

It can be divided in two parts, 17 and 78, that multiplied together give a triangular number (1326 = T₅₁).

The spelling of 1778 in words is "one thousand, seven hundred seventy-eight".