999761 has 8 divisors (see below), whose sum is σ = 1202880. Its totient is φ = 811728.

The previous prime is 999749. The next prime is 999763. The reversal of 999761 is 167999.

It is a happy number.

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 999761 - 2¹⁰ = 998737 is a prime.

It is a nialpdrome in base 10.

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 in 7 ways as a sum of consecutive naturals, for example, 3626 + ... + 3891.

It is an arithmetic number, because the mean of its divisors is an integer number (150360).

2⁹⁹⁹⁷⁶¹ is an apocalyptic number.

It is an amenable number.

999761 is a deficient number, since it is larger than the sum of its proper divisors (203119).

999761 is a wasteful number, since it uses less digits than its factorization.

999761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7543.

The product of its digits is 30618, while the sum is 41.

The square root of 999761 is about 999.8804928590. The cubic root of 999761 is about 99.9920326986.

The spelling of 999761 in words is "nine hundred ninety-nine thousand, seven hundred sixty-one".