99572138 has 8 divisors (see below), whose sum is σ = 154508580. Its totient is φ = 48069280.

The previous prime is 99572131. The next prime is 99572171. The reversal of 99572138 is 83127599.

It can be written as a sum of positive squares in 2 ways, for example, as 95316169 + 4255969 = 9763^2 + 2063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×99572138² = 19829221331782088, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99572131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858323 + ... + 858438.

Almost surely, 2^99572138 is an apocalyptic number.

99572138 is a deficient number, since it is larger than the sum of its proper divisors (54936442).

99572138 is a wasteful number, since it uses less digits than its factorization.

99572138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716792.

The product of its digits is 136080, while the sum is 44.

The square root of 99572138 is about 9978.5839676780. The cubic root of 99572138 is about 463.4959504873.

The spelling of 99572138 in words is "ninety-nine million, five hundred seventy-two thousand, one hundred thirty-eight".