18770 has 8 divisors (see below), whose sum is σ = 33804. Its totient is φ = 7504.

The previous prime is 18757. The next prime is 18773. The reversal of 18770 is 7781.

It is a Cunningham number, because it is equal to 137²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 18769 + 1 = 137^2 + 1^2 .

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

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (18773) by changing a digit.

18770 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929 + ... + 948.

2¹⁸⁷⁷⁰ is an apocalyptic number.

18770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18770 is a deficient number, since it is larger than the sum of its proper divisors (15034).

18770 is a wasteful number, since it uses less digits than its factorization.

18770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884.

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

The square root of 18770 is about 137.0036495864. The cubic root of 18770 is about 26.5759067270.

The spelling of 18770 in words is "eighteen thousand, seven hundred seventy".