99636381 has 24 divisors (see below), whose sum is σ = 158296320. Its totient is φ = 60006816.

The previous prime is 99636379. The next prime is 99636403. The reversal of 99636381 is 18363699.

99636381 is a `hidden beast` number, since 9 + 9 + 6 + 3 + 638 + 1 = 666.

It is not a de Polignac number, because 99636381 - 2¹ = 99636379 is a prime.

It is a super-2 number, since 2×99636381² = 19854816837554322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99631381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3561 + ... + 14558.

It is an arithmetic number, because the mean of its divisors is an integer number (6595680).

Almost surely, 2^99636381 is an apocalyptic number.

It is an amenable number.

99636381 is a deficient number, since it is larger than the sum of its proper divisors (58659939).

99636381 is a wasteful number, since it uses less digits than its factorization.

99636381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18185 (or 18182 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 99636381 is about 9981.8024925361. The cubic root of 99636381 is about 463.5956101224.

The spelling of 99636381 in words is "ninety-nine million, six hundred thirty-six thousand, three hundred eighty-one".