1896989 has 2 divisors, whose sum is σ = 1896990. Its totient is φ = 1896988.

The previous prime is 1896959. The next prime is 1896991. The reversal of 1896989 is 9896981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 284089 = 1270^2 + 533^2 .

It is an emirp because it is prime and its reverse (9896981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1896989 - 2¹² = 1892893 is a prime.

It is a super-2 number, since 2×1896989² = 7197134532242, which contains 22 as substring.

Together with 1896991, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1896959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948494 + 948495.

It is an arithmetic number, because the mean of its divisors is an integer number (948495).

2^1896989 is an apocalyptic number.

It is an amenable number.

1896989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1896989 is an equidigital number, since it uses as much as digits as its factorization.

1896989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 50.

The square root of 1896989 is about 1377.3122376571. The cubic root of 1896989 is about 123.7907718595.

The spelling of 1896989 in words is "one million, eight hundred ninety-six thousand, nine hundred eighty-nine".