1997695189 has 16 divisors (see below), whose sum is σ = 2363356800. Its totient is φ = 1652180544.

The previous prime is 1997695163. The next prime is 1997695201. The reversal of 1997695189 is 9815967991.

It is not a de Polignac number, because 1997695189 - 2²¹ = 1995598037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1997695189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997695159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498807 + ... + 502795.

It is an arithmetic number, because the mean of its divisors is an integer number (147709800).

Almost surely, 2^1997695189 is an apocalyptic number.

It is an amenable number.

1997695189 is a deficient number, since it is larger than the sum of its proper divisors (365661611).

1997695189 is a wasteful number, since it uses less digits than its factorization.

1997695189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6492.

The product of its digits is 11022480, while the sum is 64.

The square root of 1997695189 is about 44695.5835513980. The cubic root of 1997695189 is about 1259.4368838795.

The spelling of 1997695189 in words is "one billion, nine hundred ninety-seven million, six hundred ninety-five thousand, one hundred eighty-nine".