1997538695 has 16 divisors (see below), whose sum is σ = 2428004160. Its totient is φ = 1577452800.

The previous prime is 1997538691. The next prime is 1997538701. The reversal of 1997538695 is 5968357991.

It is not a de Polignac number, because 1997538695 - 2² = 1997538691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997538691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290750 + ... + 297540.

It is an arithmetic number, because the mean of its divisors is an integer number (151750260).

Almost surely, 2^1997538695 is an apocalyptic number.

1997538695 is a deficient number, since it is larger than the sum of its proper divisors (430465465).

1997538695 is an equidigital number, since it uses as much as digits as its factorization.

1997538695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7546.

The product of its digits is 18370800, while the sum is 62.

The square root of 1997538695 is about 44693.8328519719. The cubic root of 1997538695 is about 1259.4039960690.

The spelling of 1997538695 in words is "one billion, nine hundred ninety-seven million, five hundred thirty-eight thousand, six hundred ninety-five".