999999000397 has 2 divisors, whose sum is σ = 999999000398. Its totient is φ = 999999000396.

The previous prime is 999999000391. The next prime is 999999000461. The reversal of 999999000397 is 793000999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570887536041 + 429111464356 = 755571^2 + 655066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999000397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999000391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999500198 + 499999500199.

It is an arithmetic number, because the mean of its divisors is an integer number (499999500199).

Almost surely, 2^999999000397 is an apocalyptic number.

It is an amenable number.

999999000397 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999000397 is an equidigital number, since it uses as much as digits as its factorization.

999999000397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100442349, while the sum is 73.

The spelling of 999999000397 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, three hundred ninety-seven", and thus it is an aban number.