3999309632 has 14 divisors (see below), whose sum is σ = 7936130178. Its totient is φ = 1999654784.

The previous prime is 3999309593. The next prime is 3999309637. The reversal of 3999309632 is 2369039993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3722952256 + 276357376 = 61016^2 + 16624^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999309637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31244543 + ... + 31244670.

Almost surely, 2^3999309632 is an apocalyptic number.

3999309632 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3999309632 is a deficient number, since it is larger than the sum of its proper divisors (3936820546).

3999309632 is an equidigital number, since it uses as much as digits as its factorization.

3999309632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62489225 (or 62489215 counting only the distinct ones).

The product of its (nonzero) digits is 2125764, while the sum is 53.

The square root of 3999309632 is about 63240.0951295932. The cubic root of 3999309632 is about 1587.3097224730.

The spelling of 3999309632 in words is "three billion, nine hundred ninety-nine million, three hundred nine thousand, six hundred thirty-two".