398666843 has 8 divisors (see below), whose sum is σ = 419278848. Its totient is φ = 378328104.

The previous prime is 398666837. The next prime is 398666869. The reversal of 398666843 is 348666893.

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

It is not a de Polignac number, because 398666843 - 2¹⁰ = 398665819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398666893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65321 + ... + 71162.

It is an arithmetic number, because the mean of its divisors is an integer number (52409856).

Almost surely, 2^398666843 is an apocalyptic number.

398666843 is a deficient number, since it is larger than the sum of its proper divisors (20612005).

398666843 is a wasteful number, since it uses less digits than its factorization.

398666843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136633.

The product of its digits is 4478976, while the sum is 53.

The square root of 398666843 is about 19966.6432581944. The cubic root of 398666843 is about 735.9868232469.

The spelling of 398666843 in words is "three hundred ninety-eight million, six hundred sixty-six thousand, eight hundred forty-three".