399000689 has 4 divisors (see below), whose sum is σ = 399044724. Its totient is φ = 398956656.

The previous prime is 399000649. The next prime is 399000697. The reversal of 399000689 is 986000993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 986000993 = 2377 ⋅414809.

It can be written as a sum of positive squares in 2 ways, for example, as 231557089 + 167443600 = 15217^2 + 12940^2 .

It is a cyclic number.

It is not a de Polignac number, because 399000689 - 2¹² = 398996593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399000649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2882 + ... + 28395.

It is an arithmetic number, because the mean of its divisors is an integer number (99761181).

Almost surely, 2^399000689 is an apocalyptic number.

It is an amenable number.

399000689 is a deficient number, since it is larger than the sum of its proper divisors (44035).

399000689 is a wasteful number, since it uses less digits than its factorization.

399000689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44034.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 399000689 is about 19975.0016020024. The cubic root of 399000689 is about 736.1922058513.

The spelling of 399000689 in words is "three hundred ninety-nine million, six hundred eighty-nine", and thus it is an aban number.