1999393288 has 8 divisors (see below), whose sum is σ = 3748862430. Its totient is φ = 999696640.

The previous prime is 1999393283. The next prime is 1999393337. The reversal of 1999393288 is 8823939991.

It can be written as a sum of positive squares in only one way, i.e., 1333856484 + 665536804 = 36522^2 + 25798^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1999393283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124962073 + ... + 124962088.

Almost surely, 2^1999393288 is an apocalyptic number.

It is an amenable number.

1999393288 is a deficient number, since it is larger than the sum of its proper divisors (1749469142).

1999393288 is a wasteful number, since it uses less digits than its factorization.

1999393288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249924167 (or 249924163 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 61.

The square root of 1999393288 is about 44714.5757891093. The cubic root of 1999393288 is about 1259.7936354734.

The spelling of 1999393288 in words is "one billion, nine hundred ninety-nine million, three hundred ninety-three thousand, two hundred eighty-eight".