1999365920 has 48 divisors (see below), whose sum is σ = 5001361848. Its totient is φ = 752701440.

The previous prime is 1999365911. The next prime is 1999365931. The reversal of 1999365920 is 295639991.

It can be written as a sum of positive squares in 4 ways, for example, as 1870043536 + 129322384 = 43244^2 + 11372^2 .

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, 364811 + ... + 370250.

Almost surely, 2^1999365920 is an apocalyptic number.

1999365920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999365920 is an abundant number, since it is smaller than the sum of its proper divisors (3001995928).

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

1999365920 is a wasteful number, since it uses less digits than its factorization.

1999365920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735093 (or 735085 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 53.

The square root of 1999365920 is about 44714.2697580985. The cubic root of 1999365920 is about 1259.7878873647.

The spelling of 1999365920 in words is "one billion, nine hundred ninety-nine million, three hundred sixty-five thousand, nine hundred twenty".