99457973 has 4 divisors (see below), whose sum is σ = 105308460. Its totient is φ = 93607488.

The previous prime is 99457937. The next prime is 99457979. The reversal of 99457973 is 37975499.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37975499 = 89 ⋅426691.

It can be written as a sum of positive squares in 2 ways, for example, as 45185284 + 54272689 = 6722^2 + 7367^2 .

It is a cyclic number.

It is not a de Polignac number, because 99457973 - 2⁶ = 99457909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99457979) 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, 2925218 + ... + 2925251.

It is an arithmetic number, because the mean of its divisors is an integer number (26327115).

Almost surely, 2^99457973 is an apocalyptic number.

It is an amenable number.

99457973 is a deficient number, since it is larger than the sum of its proper divisors (5850487).

99457973 is a wasteful number, since it uses less digits than its factorization.

99457973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5850486.

The product of its digits is 2143260, while the sum is 53.

The square root of 99457973 is about 9972.8618259755. The cubic root of 99457973 is about 463.3187414390.

The spelling of 99457973 in words is "ninety-nine million, four hundred fifty-seven thousand, nine hundred seventy-three".