9947999 has 2 divisors, whose sum is σ = 9948000. Its totient is φ = 9947998.

The previous prime is 9947969. The next prime is 9948011. The reversal of 9947999 is 9997499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9947999 - 2¹² = 9943903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9947969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973999 + 4974000.

It is an arithmetic number, because the mean of its divisors is an integer number (4974000).

Almost surely, 2^9947999 is an apocalyptic number.

9947999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9947999 is an equidigital number, since it uses as much as digits as its factorization.

9947999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1653372, while the sum is 56.

The square root of 9947999 is about 3154.0448633461. The cubic root of 9947999 is about 215.0693772861.

The spelling of 9947999 in words is "nine million, nine hundred forty-seven thousand, nine hundred ninety-nine".