99447973 has 4 divisors (see below), whose sum is σ = 100810348. Its totient is φ = 98085600.

The previous prime is 99447947. The next prime is 99447979. The reversal of 99447973 is 37974499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37974499 = 617 ⋅61547.

It can be written as a sum of positive squares in 2 ways, for example, as 43467649 + 55980324 = 6593^2 + 7482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99447973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99447973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99447979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681078 + ... + 681223.

It is an arithmetic number, because the mean of its divisors is an integer number (25202587).

Almost surely, 2^99447973 is an apocalyptic number.

It is an amenable number.

99447973 is a deficient number, since it is larger than the sum of its proper divisors (1362375).

99447973 is a wasteful number, since it uses less digits than its factorization.

99447973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362374.

The product of its digits is 1714608, while the sum is 52.

The square root of 99447973 is about 9972.3604527715. The cubic root of 99447973 is about 463.3032127939.

The spelling of 99447973 in words is "ninety-nine million, four hundred forty-seven thousand, nine hundred seventy-three".