399716 has 6 divisors (see below), whose sum is σ = 699510. Its totient is φ = 199856.

The previous prime is 399691. The next prime is 399719. The reversal of 399716 is 617993.

It can be written as a sum of positive squares in only one way, i.e., 206116 + 193600 = 454^2 + 440^2 .

It is not an unprimeable number, because it can be changed into a prime (399719) by changing a digit.

399716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49961 + ... + 49968.

It is an arithmetic number, because the mean of its divisors is an integer number (116585).

2³⁹⁹⁷¹⁶ is an apocalyptic number.

It is an amenable number.

399716 is a deficient number, since it is larger than the sum of its proper divisors (299794).

399716 is a wasteful number, since it uses less digits than its factorization.

399716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99933 (or 99931 counting only the distinct ones).

The product of its digits is 10206, while the sum is 35.

The square root of 399716 is about 632.2309704530. The cubic root of 399716 is about 73.6631880952.

The spelling of 399716 in words is "three hundred ninety-nine thousand, seven hundred sixteen".