1999393337 has 2 divisors, whose sum is σ = 1999393338. Its totient is φ = 1999393336.

The previous prime is 1999393283. The next prime is 1999393339. The reversal of 1999393337 is 7333939991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971715216 + 27678121 = 44404^2 + 5261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999393337 is a prime.

Together with 1999393339, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1999393339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999696668 + 999696669.

It is an arithmetic number, because the mean of its divisors is an integer number (999696669).

Almost surely, 2^1999393337 is an apocalyptic number.

It is an amenable number.

1999393337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999393337 is an equidigital number, since it uses as much as digits as its factorization.

1999393337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3720087, while the sum is 56.

The square root of 1999393337 is about 44714.5763370291. The cubic root of 1999393337 is about 1259.7936457648.

The spelling of 1999393337 in words is "one billion, nine hundred ninety-nine million, three hundred ninety-three thousand, three hundred thirty-seven".