1897820193 has 4 divisors (see below), whose sum is σ = 2530426928. Its totient is φ = 1265213460.

The previous prime is 1897820173. The next prime is 1897820213. The reversal of 1897820193 is 3910287981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1897820173) and next prime (1897820213).

It is not a de Polignac number, because 1897820193 - 2⁵ = 1897820161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897820153) 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 3 ways as a sum of consecutive naturals, for example, 316303363 + ... + 316303368.

It is an arithmetic number, because the mean of its divisors is an integer number (632606732).

Almost surely, 2^1897820193 is an apocalyptic number.

It is an amenable number.

1897820193 is a deficient number, since it is larger than the sum of its proper divisors (632606735).

1897820193 is an equidigital number, since it uses as much as digits as its factorization.

1897820193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632606734.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1897820193 is about 43563.9781585658. The cubic root of 1897820193 is about 1238.0884945480.

The spelling of 1897820193 in words is "one billion, eight hundred ninety-seven million, eight hundred twenty thousand, one hundred ninety-three".