399416 has 8 divisors (see below), whose sum is σ = 748920. Its totient is φ = 199704.

The previous prime is 399409. The next prime is 399433. The reversal of 399416 is 614993.

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

399416 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24956 + ... + 24971.

It is an arithmetic number, because the mean of its divisors is an integer number (93615).

2³⁹⁹⁴¹⁶ is an apocalyptic number.

It is an amenable number.

399416 is a deficient number, since it is larger than the sum of its proper divisors (349504).

399416 is a wasteful number, since it uses less digits than its factorization.

399416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49933 (or 49929 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 399416 is about 631.9936708544. The cubic root of 399416 is about 73.6447546012.

The spelling of 399416 in words is "three hundred ninety-nine thousand, four hundred sixteen".