1999971652 has 36 divisors (see below), whose sum is σ = 4120457040. Its totient is φ = 846796944.

The previous prime is 1999971607. The next prime is 1999971653. The reversal of 1999971652 is 2561799991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1999971653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45202 + ... + 77737.

It is an arithmetic number, because the mean of its divisors is an integer number (114457140).

Almost surely, 2^1999971652 is an apocalyptic number.

It is an amenable number.

1999971652 is an abundant number, since it is smaller than the sum of its proper divisors (2120485388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999971652 is a wasteful number, since it uses less digits than its factorization.

1999971652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123040 (or 123031 counting only the distinct ones).

The product of its digits is 2755620, while the sum is 58.

The square root of 1999971652 is about 44721.0426085976. The cubic root of 1999971652 is about 1259.9150971598.

The spelling of 1999971652 in words is "one billion, nine hundred ninety-nine million, nine hundred seventy-one thousand, six hundred fifty-two".