1897688938 has 4 divisors (see below), whose sum is σ = 2846533410. Its totient is φ = 948844468.

The previous prime is 1897688929. The next prime is 1897688957. The reversal of 1897688938 is 8398867981.

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

It can be written as a sum of positive squares in only one way, i.e., 1789882249 + 107806689 = 42307^2 + 10383^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 474422233 + ... + 474422236.

Almost surely, 2^1897688938 is an apocalyptic number.

1897688938 is a deficient number, since it is larger than the sum of its proper divisors (948844472).

1897688938 is an equidigital number, since it uses as much as digits as its factorization.

1897688938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948844471.

The product of its digits is 41803776, while the sum is 67.

The square root of 1897688938 is about 43562.4716700051. The cubic root of 1897688938 is about 1238.0599514414.

The spelling of 1897688938 in words is "one billion, eight hundred ninety-seven million, six hundred eighty-eight thousand, nine hundred thirty-eight".