1896891 has 4 divisors (see below), whose sum is σ = 2529192. Its totient is φ = 1264592.

The previous prime is 1896889. The next prime is 1896893. The reversal of 1896891 is 1986981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1986981 = 3 ⋅662327.

It is an interprime number because it is at equal distance from previous prime (1896889) and next prime (1896893).

It is a cyclic number.

It is not a de Polignac number, because 1896891 - 2¹ = 1896889 is a prime.

It is a D-number.

1896891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1896893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316146 + ... + 316151.

It is an arithmetic number, because the mean of its divisors is an integer number (632298).

2^1896891 is an apocalyptic number.

1896891 is a deficient number, since it is larger than the sum of its proper divisors (632301).

1896891 is an equidigital number, since it uses as much as digits as its factorization.

1896891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632300.

The product of its digits is 31104, while the sum is 42.

The square root of 1896891 is about 1377.2766606604. The cubic root of 1896891 is about 123.7886401120.

The spelling of 1896891 in words is "one million, eight hundred ninety-six thousand, eight hundred ninety-one".