1994989 has 2 divisors, whose sum is σ = 1994990. Its totient is φ = 1994988.

The previous prime is 1994983. The next prime is 1995011. The reversal of 1994989 is 9894991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 6889 = 1410^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994989 - 2⁹ = 1994477 is a prime.

It is a super-2 number, since 2×1994989² = 7959962220242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997494 + 997495.

It is an arithmetic number, because the mean of its divisors is an integer number (997495).

2^1994989 is an apocalyptic number.

It is an amenable number.

1994989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994989 is an equidigital number, since it uses as much as digits as its factorization.

1994989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 49.

The square root of 1994989 is about 1412.4407952194. The cubic root of 1994989 is about 125.8867925807.

The spelling of 1994989 in words is "one million, nine hundred ninety-four thousand, nine hundred eighty-nine".