399403 has 2 divisors, whose sum is σ = 399404. Its totient is φ = 399402.

The previous prime is 399401. The next prime is 399409. The reversal of 399403 is 304993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399403 - 2¹ = 399401 is a prime.

Together with 399401, it forms a pair of twin primes.

399403 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (399401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199701 + 199702.

It is an arithmetic number, because the mean of its divisors is an integer number (199702).

2³⁹⁹⁴⁰³ is an apocalyptic number.

399403 is a deficient number, since it is larger than the sum of its proper divisors (1).

399403 is an equidigital number, since it uses as much as digits as its factorization.

399403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 399403 is about 631.9833858576. The cubic root of 399403 is about 73.6439556078.

The spelling of 399403 in words is "three hundred ninety-nine thousand, four hundred three".