1996843157 has 2 divisors, whose sum is σ = 1996843158. Its totient is φ = 1996843156.

The previous prime is 1996843153. The next prime is 1996843193. The reversal of 1996843157 is 7513486991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060544356 + 936298801 = 32566^2 + 30599^2 .

It is a cyclic number.

It is not a de Polignac number, because 1996843157 - 2² = 1996843153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1996843099 and 1996843108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1996843153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998421578 + 998421579.

It is an arithmetic number, because the mean of its divisors is an integer number (998421579).

Almost surely, 2^1996843157 is an apocalyptic number.

It is an amenable number.

1996843157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996843157 is an equidigital number, since it uses as much as digits as its factorization.

1996843157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The square root of 1996843157 is about 44686.0510338517. The cubic root of 1996843157 is about 1259.2578053214.

The spelling of 1996843157 in words is "one billion, nine hundred ninety-six million, eight hundred forty-three thousand, one hundred fifty-seven".