999766 has 4 divisors (see below), whose sum is σ = 1499652. Its totient is φ = 499882.

The previous prime is 999763. The next prime is 999769. The reversal of 999766 is 667999.

999766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (999763) and next prime (999769).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249940 + ... + 249943.

It is an arithmetic number, because the mean of its divisors is an integer number (374913).

2⁹⁹⁹⁷⁶⁶ is an apocalyptic number.

999766 is a deficient number, since it is larger than the sum of its proper divisors (499886).

999766 is a wasteful number, since it uses less digits than its factorization.

999766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499885.

The product of its digits is 183708, while the sum is 46.

The square root of 999766 is about 999.8829931547. The cubic root of 999766 is about 99.9921993915.

The spelling of 999766 in words is "nine hundred ninety-nine thousand, seven hundred sixty-six".