1989499 has 2 divisors, whose sum is σ = 1989500. Its totient is φ = 1989498.

The previous prime is 1989479. The next prime is 1989517. The reversal of 1989499 is 9949891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1989499 - 2¹¹ = 1987451 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1989419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994749 + 994750.

It is an arithmetic number, because the mean of its divisors is an integer number (994750).

2^1989499 is an apocalyptic number.

1989499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989499 is an equidigital number, since it uses as much as digits as its factorization.

1989499 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 1989499 is about 1410.4960120468. The cubic root of 1989499 is about 125.7712107531.

The spelling of 1989499 in words is "one million, nine hundred eighty-nine thousand, four hundred ninety-nine".