999956 has 6 divisors (see below), whose sum is σ = 1749930. Its totient is φ = 499976.

The previous prime is 999953. The next prime is 999959. The reversal of 999956 is 659999.

It is an interprime number because it is at equal distance from previous prime (999953) and next prime (999959).

It can be written as a sum of positive squares in only one way, i.e., 749956 + 250000 = 866^2 + 500^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 999956.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999956.

It is not an unprimeable number, because it can be changed into a prime (999953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124991 + ... + 124998.

It is an arithmetic number, because the mean of its divisors is an integer number (291655).

2⁹⁹⁹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

999956 is a deficient number, since it is larger than the sum of its proper divisors (749974).

999956 is a wasteful number, since it uses less digits than its factorization.

999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249993 (or 249991 counting only the distinct ones).

The product of its digits is 196830, while the sum is 47.

The square root of 999956 is about 999.9779997580. The cubic root of 999956 is about 99.9985333118.

It can be divided in two parts, 99995 and 6, that added together give a palindrome (100001).

The spelling of 999956 in words is "nine hundred ninety-nine thousand, nine hundred fifty-six".