399603 has 4 divisors (see below), whose sum is σ = 532808. Its totient is φ = 266400.

The previous prime is 399601. The next prime is 399613. The reversal of 399603 is 306993.

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

It is not a de Polignac number, because 399603 - 2¹ = 399601 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (399601) 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, 66598 + ... + 66603.

It is an arithmetic number, because the mean of its divisors is an integer number (133202).

2³⁹⁹⁶⁰³ is an apocalyptic number.

399603 is a deficient number, since it is larger than the sum of its proper divisors (133205).

399603 is a wasteful number, since it uses less digits than its factorization.

399603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133204.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 399603 is about 632.1415980617. The cubic root of 399603 is about 73.6562458955.

The spelling of 399603 in words is "three hundred ninety-nine thousand, six hundred three".