1890897 has 4 divisors (see below), whose sum is σ = 2521200. Its totient is φ = 1260596.

The previous prime is 1890877. The next prime is 1890901. The reversal of 1890897 is 7980981.

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 a cyclic number.

It is not a de Polignac number, because 1890897 - 2⁷ = 1890769 is a prime.

It is a D-number.

1890897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1890827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315147 + ... + 315152.

It is an arithmetic number, because the mean of its divisors is an integer number (630300).

2^1890897 is an apocalyptic number.

It is an amenable number.

1890897 is a deficient number, since it is larger than the sum of its proper divisors (630303).

1890897 is an equidigital number, since it uses as much as digits as its factorization.

1890897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630302.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1890897 is about 1375.0989055337. The cubic root of 1890897 is about 123.6581156516.

The spelling of 1890897 in words is "one million, eight hundred ninety thousand, eight hundred ninety-seven".