398949 has 8 divisors (see below), whose sum is σ = 539712. Its totient is φ = 262080.

The previous prime is 398941. The next prime is 398969. The reversal of 398949 is 949893.

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

It is not a de Polignac number, because 398949 - 2³ = 398941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398949.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 724 + ... + 1149.

It is an arithmetic number, because the mean of its divisors is an integer number (67464).

2³⁹⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

398949 is a deficient number, since it is larger than the sum of its proper divisors (140763).

398949 is a wasteful number, since it uses less digits than its factorization.

398949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947.

The product of its digits is 69984, while the sum is 42.

The square root of 398949 is about 631.6240970704. The cubic root of 398949 is about 73.6160414192.

It can be divided in two parts, 39894 and 9, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 398949 in words is "three hundred ninety-eight thousand, nine hundred forty-nine".