399205617 has 8 divisors (see below), whose sum is σ = 546660096. Its totient is φ = 258944112.

The previous prime is 399205613. The next prime is 399205663. The reversal of 399205617 is 716502993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399205617 - 2² = 399205613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399205613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1798113 + ... + 1798334.

It is an arithmetic number, because the mean of its divisors is an integer number (68332512).

Almost surely, 2^399205617 is an apocalyptic number.

399205617 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

399205617 is a deficient number, since it is larger than the sum of its proper divisors (147454479).

399205617 is a wasteful number, since it uses less digits than its factorization.

399205617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596487.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 399205617 is about 19980.1305551290. The cubic root of 399205617 is about 736.3182211519.

The spelling of 399205617 in words is "three hundred ninety-nine million, two hundred five thousand, six hundred seventeen".