1997097957 has 16 divisors (see below), whose sum is σ = 2960215360. Its totient is φ = 1330700400.

The previous prime is 1997097937. The next prime is 1997098031. The reversal of 1997097957 is 7597907991.

It is not a de Polignac number, because 1997097957 - 2⁸ = 1997097701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997097894 and 1997097903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997097917) 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 15 ways as a sum of consecutive naturals, for example, 35907 + ... + 72687.

It is an arithmetic number, because the mean of its divisors is an integer number (185013460).

Almost surely, 2^1997097957 is an apocalyptic number.

It is an amenable number.

1997097957 is a deficient number, since it is larger than the sum of its proper divisors (963117403).

1997097957 is a wasteful number, since it uses less digits than its factorization.

1997097957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38801 (or 38795 counting only the distinct ones).

The product of its (nonzero) digits is 11252115, while the sum is 63.

The square root of 1997097957 is about 44688.9019444425. The cubic root of 1997097957 is about 1259.3113640667.

The spelling of 1997097957 in words is "one billion, nine hundred ninety-seven million, ninety-seven thousand, nine hundred fifty-seven".