398947 has 4 divisors (see below), whose sum is σ = 400960. Its totient is φ = 396936.

The previous prime is 398941. The next prime is 398969. The reversal of 398947 is 749893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398947 - 2⁷ = 398819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672 + ... + 1117.

It is an arithmetic number, because the mean of its divisors is an integer number (100240).

2³⁹⁸⁹⁴⁷ is an apocalyptic number.

398947 is a deficient number, since it is larger than the sum of its proper divisors (2013).

398947 is a wasteful number, since it uses less digits than its factorization.

398947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012.

The product of its digits is 54432, while the sum is 40.

The square root of 398947 is about 631.6225138483. The cubic root of 398947 is about 73.6159184023.

The spelling of 398947 in words is "three hundred ninety-eight thousand, nine hundred forty-seven".