1997492815 has 4 divisors (see below), whose sum is σ = 2396991384. Its totient is φ = 1597994248.

The previous prime is 1997492789. The next prime is 1997492821. The reversal of 1997492815 is 5182947991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5182947991 = 13 ⋅398688307.

It is a cyclic number.

It is not a de Polignac number, because 1997492815 - 2⁷ = 1997492687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199749277 + ... + 199749286.

It is an arithmetic number, because the mean of its divisors is an integer number (599247846).

Almost surely, 2^1997492815 is an apocalyptic number.

1997492815 is a deficient number, since it is larger than the sum of its proper divisors (399498569).

1997492815 is an equidigital number, since it uses as much as digits as its factorization.

1997492815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399498568.

The product of its digits is 1632960, while the sum is 55.

The square root of 1997492815 is about 44693.3195791049. The cubic root of 1997492815 is about 1259.3943538866.

The spelling of 1997492815 in words is "one billion, nine hundred ninety-seven million, four hundred ninety-two thousand, eight hundred fifteen".