99771938 has 18 divisors (see below), whose sum is σ = 174264561. Its totient is φ = 42717024.

The previous prime is 99771863. The next prime is 99771949. The reversal of 99771938 is 83917799.

It can be written as a sum of positive squares in 2 ways, for example, as 95902849 + 3869089 = 9793^2 + 1967^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7063.

It is a super-2 number, since 2×99771938² = 19908879224551688, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99771938.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 98378 + ... + 99386.

Almost surely, 2^99771938 is an apocalyptic number.

99771938 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

99771938 is a deficient number, since it is larger than the sum of its proper divisors (74492623).

99771938 is an equidigital number, since it uses as much as digits as its factorization.

99771938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034 (or 1018 counting only the distinct ones).

The product of its digits is 857304, while the sum is 53.

The square root of 99771938 is about 9988.5903910412. The cubic root of 99771938 is about 463.8057580994.

The spelling of 99771938 in words is "ninety-nine million, seven hundred seventy-one thousand, nine hundred thirty-eight".