99984457 has 2 divisors, whose sum is σ = 99984458. Its totient is φ = 99984456.

The previous prime is 99984449. The next prime is 99984461. The reversal of 99984457 is 75448999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87160896 + 12823561 = 9336^2 + 3581^2 .

It is an emirp because it is prime and its reverse (75448999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99984457 - 2³ = 99984449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99984398 and 99984407.

It is not a weakly prime, because it can be changed into another prime (99984487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49992228 + 49992229.

It is an arithmetic number, because the mean of its divisors is an integer number (49992229).

Almost surely, 2^99984457 is an apocalyptic number.

It is an amenable number.

99984457 is a deficient number, since it is larger than the sum of its proper divisors (1).

99984457 is an equidigital number, since it uses as much as digits as its factorization.

99984457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The square root of 99984457 is about 9999.2228197995. Note that the first 3 decimals coincide. The cubic root of 99984457 is about 464.1348340435.

The spelling of 99984457 in words is "ninety-nine million, nine hundred eighty-four thousand, four hundred fifty-seven".