999999970 has 16 divisors (see below), whose sum is σ = 1801411128. Its totient is φ = 399686400.

The previous prime is 999999937. The next prime is 1000000007. The reversal of 999999970 is 79999999.

It can be written as a sum of positive squares in 4 ways, for example, as 982885201 + 17114769 = 31351^2 + 4137^2 .

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999999970.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25581 + ... + 51520.

Almost surely, 2^999999970 is an apocalyptic number.

999999970 is a deficient number, since it is larger than the sum of its proper divisors (801411158).

999999970 is a wasteful number, since it uses less digits than its factorization.

999999970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78405.

The product of its (nonzero) digits is 33480783, while the sum is 70.

The square root of 999999970 is about 31622.7761273421. The cubic root of 999999970 is about 999.9999900000. Note that the first 5 decimals are identical.

The spelling of 999999970 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy".