1999909672 has 16 divisors (see below), whose sum is σ = 3752532000. Its totient is φ = 999234480.

The previous prime is 1999909649. The next prime is 1999909711. The reversal of 1999909672 is 2769099991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999909672.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78154 + ... + 100537.

It is an arithmetic number, because the mean of its divisors is an integer number (234533250).

Almost surely, 2^1999909672 is an apocalyptic number.

It is an amenable number.

1999909672 is a deficient number, since it is larger than the sum of its proper divisors (1752622328).

1999909672 is a wasteful number, since it uses less digits than its factorization.

1999909672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180096 (or 180092 counting only the distinct ones).

The product of its (nonzero) digits is 4960116, while the sum is 61.

The square root of 1999909672 is about 44720.3496408514. The cubic root of 1999909672 is about 1259.9020819179.

The spelling of 1999909672 in words is "one billion, nine hundred ninety-nine million, nine hundred nine thousand, six hundred seventy-two".