1897921834 has 4 divisors (see below), whose sum is σ = 2846882754. Its totient is φ = 948960916.

The previous prime is 1897921813. The next prime is 1897921841. The reversal of 1897921834 is 4381297981.

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., 1755191025 + 142730809 = 41895^2 + 11947^2 .

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 as a sum of consecutive naturals, namely, 474480457 + ... + 474480460.

Almost surely, 2^1897921834 is an apocalyptic number.

1897921834 is a deficient number, since it is larger than the sum of its proper divisors (948960920).

1897921834 is an equidigital number, since it uses as much as digits as its factorization.

1897921834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948960919.

The product of its digits is 870912, while the sum is 52.

The square root of 1897921834 is about 43565.1447145536. The cubic root of 1897921834 is about 1238.1105968010.

The spelling of 1897921834 in words is "one billion, eight hundred ninety-seven million, nine hundred twenty-one thousand, eight hundred thirty-four".