399478 has 4 divisors (see below), whose sum is σ = 599220. Its totient is φ = 199738.

The previous prime is 399473. The next prime is 399481. The reversal of 399478 is 874993.

399478 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 399478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99868 + ... + 99871.

It is an arithmetic number, because the mean of its divisors is an integer number (149805).

2³⁹⁹⁴⁷⁸ is an apocalyptic number.

399478 is a deficient number, since it is larger than the sum of its proper divisors (199742).

399478 is a wasteful number, since it uses less digits than its factorization.

399478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199741.

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

The square root of 399478 is about 632.0427200752. The cubic root of 399478 is about 73.6485649464.

The spelling of 399478 in words is "three hundred ninety-nine thousand, four hundred seventy-eight".