3999339646 has 4 divisors (see below), whose sum is σ = 5999009472. Its totient is φ = 1999669822.

The previous prime is 3999339637. The next prime is 3999339647. The reversal of 3999339646 is 6469339993.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999339647) 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 as a sum of consecutive naturals, namely, 999834910 + ... + 999834913.

It is an arithmetic number, because the mean of its divisors is an integer number (1499752368).

Almost surely, 2^3999339646 is an apocalyptic number.

3999339646 is a deficient number, since it is larger than the sum of its proper divisors (1999669826).

3999339646 is a wasteful number, since it uses less digits than its factorization.

3999339646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999669825.

The product of its digits is 25509168, while the sum is 61.

The square root of 3999339646 is about 63240.3324311313. The cubic root of 3999339646 is about 1587.3136932745.

The spelling of 3999339646 in words is "three billion, nine hundred ninety-nine million, three hundred thirty-nine thousand, six hundred forty-six".