399241685 has 8 divisors (see below), whose sum is σ = 507271896. Its totient is φ = 300605440.

The previous prime is 399241673. The next prime is 399241721. The reversal of 399241685 is 586142993.

It can be written as a sum of positive squares in 4 ways, for example, as 62078641 + 337163044 = 7879^2 + 18362^2 .

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

It is not a de Polignac number, because 399241685 - 2¹² = 399237589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2348396 + ... + 2348565.

It is an arithmetic number, because the mean of its divisors is an integer number (63408987).

Almost surely, 2^399241685 is an apocalyptic number.

It is an amenable number.

399241685 is a deficient number, since it is larger than the sum of its proper divisors (108030211).

399241685 is a wasteful number, since it uses less digits than its factorization.

399241685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4696983.

The product of its digits is 466560, while the sum is 47.

The square root of 399241685 is about 19981.0331314474. The cubic root of 399241685 is about 736.3403957947.

The spelling of 399241685 in words is "three hundred ninety-nine million, two hundred forty-one thousand, six hundred eighty-five".