1890193 has 2 divisors, whose sum is σ = 1890194. Its totient is φ = 1890192.

The previous prime is 1890173. The next prime is 1890211. The reversal of 1890193 is 3910981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1871424 + 18769 = 1368^2 + 137^2 .

It is an emirp because it is prime and its reverse (3910981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945096 + 945097.

It is an arithmetic number, because the mean of its divisors is an integer number (945097).

2^1890193 is an apocalyptic number.

It is an amenable number.

1890193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890193 is an equidigital number, since it uses as much as digits as its factorization.

1890193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1890193 is about 1374.8429001162. The cubic root of 1890193 is about 123.6427673593.

The spelling of 1890193 in words is "one million, eight hundred ninety thousand, one hundred ninety-three".