399983689 has 8 divisors (see below), whose sum is σ = 472887360. Its totient is φ = 331020816.

The previous prime is 399983663. The next prime is 399983699. The reversal of 399983689 is 986389993.

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

It is not a de Polignac number, because 399983689 - 2⁵ = 399983657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399983689.

It is not an unprimeable number, because it can be changed into a prime (399983609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984979 + ... + 985384.

It is an arithmetic number, because the mean of its divisors is an integer number (59110920).

Almost surely, 2^399983689 is an apocalyptic number.

It is an amenable number.

399983689 is a deficient number, since it is larger than the sum of its proper divisors (72903671).

399983689 is a wasteful number, since it uses less digits than its factorization.

399983689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970399.

The product of its digits is 22674816, while the sum is 64.

The square root of 399983689 is about 19999.5922208429. The cubic root of 399983689 is about 736.7962845523.

The spelling of 399983689 in words is "three hundred ninety-nine million, nine hundred eighty-three thousand, six hundred eighty-nine".