999617 has 8 divisors (see below), whose sum is σ = 1069056. Its totient is φ = 931392.

The previous prime is 999613. The next prime is 999623. The reversal of 999617 is 716999.

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 999617 - 2² = 999613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999611) 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, 1928 + ... + 2390.

It is an arithmetic number, because the mean of its divisors is an integer number (133632).

2⁹⁹⁹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

999617 is a deficient number, since it is larger than the sum of its proper divisors (69439).

999617 is a wasteful number, since it uses less digits than its factorization.

999617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607.

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

The square root of 999617 is about 999.8084816604. The cubic root of 999617 is about 99.9872317031.

The spelling of 999617 in words is "nine hundred ninety-nine thousand, six hundred seventeen".