99997970 has 16 divisors (see below), whose sum is σ = 180615960. Its totient is φ = 39861504.

The previous prime is 99997957. The next prime is 99997973. The reversal of 99997970 is 7979999.

It can be written as a sum of positive squares in 4 ways, for example, as 84842521 + 15155449 = 9211^2 + 3893^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99997973) 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, 14135 + ... + 19994.

Almost surely, 2^99997970 is an apocalyptic number.

99997970 is a deficient number, since it is larger than the sum of its proper divisors (80617990).

99997970 is a wasteful number, since it uses less digits than its factorization.

99997970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34429.

The product of its (nonzero) digits is 2893401, while the sum is 59.

The square root of 99997970 is about 9999.8984994849. The cubic root of 99997970 is about 464.1557425316.

The spelling of 99997970 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred seventy".