987493789 has 2 divisors, whose sum is σ = 987493790. Its totient is φ = 987493788.

The previous prime is 987493781. The next prime is 987493813. The reversal of 987493789 is 987394789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 916091289 + 71402500 = 30267^2 + 8450^2 .

It is a cyclic number.

It is not a de Polignac number, because 987493789 - 2³ = 987493781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 987493789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987493781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493746894 + 493746895.

It is an arithmetic number, because the mean of its divisors is an integer number (493746895).

Almost surely, 2^987493789 is an apocalyptic number.

It is an amenable number.

987493789 is a deficient number, since it is larger than the sum of its proper divisors (1).

987493789 is an equidigital number, since it uses as much as digits as its factorization.

987493789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 64.

The square root of 987493789 is about 31424.4139006601. The cubic root of 987493789 is about 995.8137628727.

It can be divided in two parts, 987493 and 789, that multiplied together give a palindrome (779131977).

The spelling of 987493789 in words is "nine hundred eighty-seven million, four hundred ninety-three thousand, seven hundred eighty-nine".