99987489 has 36 divisors (see below), whose sum is σ = 177902244. Its totient is φ = 53770752.

The previous prime is 99987467. The next prime is 99987497. The reversal of 99987489 is 98478999.

It can be written as a sum of positive squares in 2 ways, for example, as 53406864 + 46580625 = 7308^2 + 6825^2 .

It is not a de Polignac number, because 99987489 - 2⁵ = 99987457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (99987449) 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 in 35 ways as a sum of consecutive naturals, for example, 829 + ... + 14165.

It is an arithmetic number, because the mean of its divisors is an integer number (4941729).

Almost surely, 2^99987489 is an apocalyptic number.

It is an amenable number.

99987489 is a deficient number, since it is larger than the sum of its proper divisors (77914755).

99987489 is a wasteful number, since it uses less digits than its factorization.

99987489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13374 (or 13364 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 99987489 is about 9999.3744304331. The cubic root of 99987489 is about 464.1395255813.

It can be divided in two parts, 999 and 87489, that added together give a palindrome (88488).

The spelling of 99987489 in words is "ninety-nine million, nine hundred eighty-seven thousand, four hundred eighty-nine".