99989973 has 24 divisors (see below), whose sum is σ = 149610240. Its totient is φ = 64284480.

The previous prime is 99989963. The next prime is 99989983. The reversal of 99989973 is 37998999.

It is an interprime number because it is at equal distance from previous prime (99989963) and next prime (99989983).

It is not a de Polignac number, because 99989973 - 2⁶ = 99989909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99989973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99989963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123193 + ... + 124001.

It is an arithmetic number, because the mean of its divisors is an integer number (6233760).

Almost surely, 2^99989973 is an apocalyptic number.

99989973 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

It is an amenable number.

99989973 is a deficient number, since it is larger than the sum of its proper divisors (49620267).

99989973 is a wasteful number, since it uses less digits than its factorization.

99989973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1286 counting only the distinct ones).

The product of its digits is 9920232, while the sum is 63.

The square root of 99989973 is about 9999.4986374318. The cubic root of 99989973 is about 464.1433691056.

The spelling of 99989973 in words is "ninety-nine million, nine hundred eighty-nine thousand, nine hundred seventy-three".