1997958115 has 4 divisors (see below), whose sum is σ = 2397549744. Its totient is φ = 1598366488.

The previous prime is 1997958077. The next prime is 1997958139. The reversal of 1997958115 is 5118597991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1997958115 - 2⁹ = 1997957603 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199795807 + ... + 199795816.

It is an arithmetic number, because the mean of its divisors is an integer number (599387436).

Almost surely, 2^1997958115 is an apocalyptic number.

1997958115 is a deficient number, since it is larger than the sum of its proper divisors (399591629).

1997958115 is an equidigital number, since it uses as much as digits as its factorization.

1997958115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399591628.

The product of its digits is 1020600, while the sum is 55.

The square root of 1997958115 is about 44698.5247519423. The cubic root of 1997958115 is about 1259.4921349137.

The spelling of 1997958115 in words is "one billion, nine hundred ninety-seven million, nine hundred fifty-eight thousand, one hundred fifteen".