1987099 has 2 divisors, whose sum is σ = 1987100. Its totient is φ = 1987098.

The previous prime is 1987091. The next prime is 1987121. The reversal of 1987099 is 9907891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1987099 - 2³ = 1987091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1987091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993549 + 993550.

It is an arithmetic number, because the mean of its divisors is an integer number (993550).

2^1987099 is an apocalyptic number.

1987099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987099 is an equidigital number, since it uses as much as digits as its factorization.

1987099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1987099 is about 1409.6449907690. The cubic root of 1987099 is about 125.7206163798.

The spelling of 1987099 in words is "one million, nine hundred eighty-seven thousand, ninety-nine".