999970 has 24 divisors (see below), whose sum is σ = 1906524. Its totient is φ = 377568.

The previous prime is 999961. The next prime is 999979. The reversal of 999970 is 79999.

It is an interprime number because it is at equal distance from previous prime (999961) and next prime (999979).

It can be written as a sum of positive squares in 2 ways, for example, as 938961 + 61009 = 969^2 + 247^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10 and base 16.

It is not an unprimeable number, because it can be changed into a prime (999979) by changing a digit.

999970 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3472 + ... + 3748.

2⁹⁹⁹⁹⁷⁰ is an apocalyptic number.

999970 is a deficient number, since it is larger than the sum of its proper divisors (906554).

999970 is a wasteful number, since it uses less digits than its factorization.

999970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 43.

The square root of 999970 is about 999.9849998875. The cubic root of 999970 is about 99.9989999900.

The spelling of 999970 in words is "nine hundred ninety-nine thousand, nine hundred seventy".