396989 has 4 divisors (see below), whose sum is σ = 401856. Its totient is φ = 392124.

The previous prime is 396983. The next prime is 396997. The reversal of 396989 is 989693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989693 = 251 ⋅3943.

It is a cyclic number.

It is not a de Polignac number, because 396989 - 2⁸ = 396733 is a prime.

It is a super-2 number, since 2×396989² = 315200532242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2309 + ... + 2474.

It is an arithmetic number, because the mean of its divisors is an integer number (100464).

2³⁹⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

396989 is a deficient number, since it is larger than the sum of its proper divisors (4867).

396989 is an equidigital number, since it uses as much as digits as its factorization.

396989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4866.

The product of its digits is 104976, while the sum is 44.

The square root of 396989 is about 630.0706309613. The cubic root of 396989 is about 73.4952871552.

Subtracting 396989 from its reverse (989693), we obtain a cube (592704 = 84³).

The spelling of 396989 in words is "three hundred ninety-six thousand, nine hundred eighty-nine".