1963889 has 2 divisors, whose sum is σ = 1963890. Its totient is φ = 1963888.

The previous prime is 1963883. The next prime is 1963921. The reversal of 1963889 is 9883691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1311025 + 652864 = 1145^2 + 808^2 .

It is a cyclic number.

It is not a de Polignac number, because 1963889 - 2⁴ = 1963873 is a prime.

It is a super-3 number, since 3×1963889³ = 22723334811077893107, which contains 333 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1963883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981944 + 981945.

It is an arithmetic number, because the mean of its divisors is an integer number (981945).

2^1963889 is an apocalyptic number.

It is an amenable number.

1963889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963889 is an equidigital number, since it uses as much as digits as its factorization.

1963889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 1963889 is about 1401.3882402818. The cubic root of 1963889 is about 125.2292114400.

The spelling of 1963889 in words is "one million, nine hundred sixty-three thousand, eight hundred eighty-nine".