99987138 has 24 divisors (see below), whose sum is σ = 216876348. Its totient is φ = 33292512.

The previous prime is 99987133. The next prime is 99987161. The reversal of 99987138 is 83178999.

It can be written as a sum of positive squares in 2 ways, for example, as 95589729 + 4397409 = 9777^2 + 2097^2 .

It is not an unprimeable number, because it can be changed into a prime (99987131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17620 + ... + 22592.

Almost surely, 2^99987138 is an apocalyptic number.

99987138 is an abundant number, since it is smaller than the sum of its proper divisors (116889210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99987138 is a wasteful number, since it uses less digits than its factorization.

99987138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6098 (or 6095 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 99987138 is about 9999.3568793198. The cubic root of 99987138 is about 464.1389824695.

The spelling of 99987138 in words is "ninety-nine million, nine hundred eighty-seven thousand, one hundred thirty-eight".