39818 has 8 divisors (see below), whose sum is σ = 61248. Its totient is φ = 19404.

The previous prime is 39799. The next prime is 39821. The reversal of 39818 is 81893.

39818 = 52² + 53² + ... + 63².

It is a happy number.

39818 is digitally balanced in base 2, 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 317.

It is an arithmetic number, because the mean of its divisors is an integer number (7656).

2³⁹⁸¹⁸ is an apocalyptic number.

39818 is a deficient number, since it is larger than the sum of its proper divisors (21430).

39818 is a wasteful number, since it uses less digits than its factorization.

39818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its digits is 1728, while the sum is 29.

The square root of 39818 is about 199.5444812567. The cubic root of 39818 is about 34.1475707953.

The spelling of 39818 in words is "thirty-nine thousand, eight hundred eighteen".