99977 has 4 divisors (see below), whose sum is σ = 105876. Its totient is φ = 94080.

The previous prime is 99971. The next prime is 99989. The reversal of 99977 is 77999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80656 + 19321 = 284^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 99977 - 2⁴ = 99961 is a prime.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2924 + ... + 2957.

It is an arithmetic number, because the mean of its divisors is an integer number (26469).

2⁹⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

99977 is a deficient number, since it is larger than the sum of its proper divisors (5899).

99977 is a wasteful number, since it uses less digits than its factorization.

99977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5898.

The product of its digits is 35721, while the sum is 41.

The square root of 99977 is about 316.1913977324. The cubic root of 99977 is about 46.4123295118.

The spelling of 99977 in words is "ninety-nine thousand, nine hundred seventy-seven".