399473 has 2 divisors, whose sum is σ = 399474. Its totient is φ = 399472.

The previous prime is 399439. The next prime is 399481. The reversal of 399473 is 374993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399424 + 49 = 632^2 + 7^2 .

It is an emirp because it is prime and its reverse (374993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399473 - 2⁶ = 399409 is a prime.

It is not a weakly prime, because it can be changed into another prime (399403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199736 + 199737.

It is an arithmetic number, because the mean of its divisors is an integer number (199737).

2³⁹⁹⁴⁷³ is an apocalyptic number.

It is an amenable number.

399473 is a deficient number, since it is larger than the sum of its proper divisors (1).

399473 is an equidigital number, since it uses as much as digits as its factorization.

399473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 35.

The square root of 399473 is about 632.0387646339. The cubic root of 399473 is about 73.6482576751.

The spelling of 399473 in words is "three hundred ninety-nine thousand, four hundred seventy-three".