393812 has 6 divisors (see below), whose sum is σ = 689178. Its totient is φ = 196904.

The previous prime is 393797. The next prime is 393847. The reversal of 393812 is 218393.

It can be written as a sum of positive squares in only one way, i.e., 391876 + 1936 = 626^2 + 44^2 .

It is a congruent number.

It is an unprimeable number.

393812 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 as a sum of consecutive naturals, namely, 49223 + ... + 49230.

It is an arithmetic number, because the mean of its divisors is an integer number (114863).

2³⁹³⁸¹² is an apocalyptic number.

It is an amenable number.

393812 is a deficient number, since it is larger than the sum of its proper divisors (295366).

393812 is a wasteful number, since it uses less digits than its factorization.

393812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98457 (or 98455 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 393812 is about 627.5444207385. The cubic root of 393812 is about 73.2987072527.

The spelling of 393812 in words is "three hundred ninety-three thousand, eight hundred twelve".