1997956803 has 4 divisors (see below), whose sum is σ = 2663942408. Its totient is φ = 1331971200.

The previous prime is 1997956781. The next prime is 1997956813. The reversal of 1997956803 is 3086597991.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1997956803 - 2⁹ = 1997956291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997956813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332992798 + ... + 332992803.

It is an arithmetic number, because the mean of its divisors is an integer number (665985602).

Almost surely, 2^1997956803 is an apocalyptic number.

1997956803 is a deficient number, since it is larger than the sum of its proper divisors (665985605).

1997956803 is an equidigital number, since it uses as much as digits as its factorization.

1997956803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665985604.

The product of its (nonzero) digits is 3674160, while the sum is 57.

The square root of 1997956803 is about 44698.5100758403. The cubic root of 1997956803 is about 1259.4918592233.

The spelling of 1997956803 in words is "one billion, nine hundred ninety-seven million, nine hundred fifty-six thousand, eight hundred three".