9999977 has 8 divisors (see below), whose sum is σ = 10811976.
Its totient is φ = 9194112.
The previous prime is 9999973. The next prime is 9999991. The reversal of 9999977 is 7799999.
It can be written as a sum of positive squares in 4 ways, for example, as 290521 + 9709456 = 539^2 + 3116^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 9999977 - 22 = 9999973 is a prime.
It is an Ulam number.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (9999971) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213 + ... + 4989.
It is an arithmetic number, because the mean of its divisors is an integer number (1351497).
Almost surely, 29999977 is an apocalyptic number.
It is an amenable number.
9999977 is a deficient number, since it is larger than the sum of its proper divisors (811999).
9999977 is a wasteful number, since it uses less digits than its factorization.
9999977 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3067.
The product of its digits is 2893401, while the sum is 59.
The square root of 9999977 is about 3162.2740235470.
The cubic root of 9999977 is about 215.4433038297.
The spelling of 9999977 in words is "nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".