1999721932 has 24 divisors (see below), whose sum is σ = 3824962736. Its totient is φ = 909171648.

The previous prime is 1999721921. The next prime is 1999721953. The reversal of 1999721932 is 2391279991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 1999721932.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 283503 + ... + 290470.

Almost surely, 2^1999721932 is an apocalyptic number.

It is an amenable number.

1999721932 is a deficient number, since it is larger than the sum of its proper divisors (1825240804).

1999721932 is a wasteful number, since it uses less digits than its factorization.

1999721932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574057 (or 574055 counting only the distinct ones).

The product of its digits is 551124, while the sum is 52.

The square root of 1999721932 is about 44718.2505471759. The cubic root of 1999721932 is about 1259.8626565675.

The spelling of 1999721932 in words is "one billion, nine hundred ninety-nine million, seven hundred twenty-one thousand, nine hundred thirty-two".