398812 has 12 divisors (see below), whose sum is σ = 703080. Its totient is φ = 197936.

The previous prime is 398771. The next prime is 398813. The reversal of 398812 is 218893.

398812 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×398812² = 318102022688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398813) by changing a digit.

398812 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, 438 + ... + 994.

It is an arithmetic number, because the mean of its divisors is an integer number (58590).

2³⁹⁸⁸¹² is an apocalyptic number.

It is an amenable number.

398812 is a deficient number, since it is larger than the sum of its proper divisors (304268).

398812 is a wasteful number, since it uses less digits than its factorization.

398812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 738 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 398812 is about 631.5156371777. The cubic root of 398812 is about 73.6076138154.

The spelling of 398812 in words is "three hundred ninety-eight thousand, eight hundred twelve".