9999970 has 16 divisors (see below), whose sum is σ = 18037368.
Its totient is φ = 3991680.
The previous prime is 9999943. The next prime is 9999971. The reversal of 9999970 is 799999.
It can be written as a sum of positive squares in 4 ways, for example, as 9778129 + 221841 = 3127^2 + 471^2
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (9999971) 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, 6910 + ... + 8230.
Almost surely, 29999970 is an apocalyptic number.
9999970 is a deficient number, since it is larger than the sum of its proper divisors (8037398).
9999970 is a wasteful number, since it uses less digits than its factorization.
9999970 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2085.
The product of its (nonzero) digits is 413343, while the sum is 52.
The square root of 9999970 is about 3162.2729167483.
The cubic root of 9999970 is about 215.4432535595.
The spelling of 9999970 in words is "nine million, nine hundred ninety-nine thousand, nine hundred seventy".