1997959399 has 2 divisors, whose sum is σ = 1997959400. Its totient is φ = 1997959398.

The previous prime is 1997959373. The next prime is 1997959417. The reversal of 1997959399 is 9939597991.

It is a strong prime.

It is an emirp because it is prime and its reverse (9939597991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997959399 - 2⁵ = 1997959367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997959349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998979699 + 998979700.

It is an arithmetic number, because the mean of its divisors is an integer number (998979700).

Almost surely, 2^1997959399 is an apocalyptic number.

1997959399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997959399 is an equidigital number, since it uses as much as digits as its factorization.

1997959399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55801305, while the sum is 70.

The square root of 1997959399 is about 44698.5391148301. The cubic root of 1997959399 is about 1259.4924047205.

The spelling of 1997959399 in words is "one billion, nine hundred ninety-seven million, nine hundred fifty-nine thousand, three hundred ninety-nine".