29997917 has 2 divisors, whose sum is σ = 29997918. Its totient is φ = 29997916.

The previous prime is 29997907. The next prime is 29997949. The reversal of 29997917 is 71979992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23951236 + 6046681 = 4894^2 + 2459^2 .

It is a cyclic number.

It is not a de Polignac number, because 29997917 - 2⁸ = 29997661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29997907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14998958 + 14998959.

It is an arithmetic number, because the mean of its divisors is an integer number (14998959).

Almost surely, 2^29997917 is an apocalyptic number.

It is an amenable number.

29997917 is a deficient number, since it is larger than the sum of its proper divisors (1).

29997917 is an equidigital number, since it uses as much as digits as its factorization.

29997917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 642978, while the sum is 53.

The square root of 29997917 is about 5477.0354207363. The cubic root of 29997917 is about 310.7160589119.

The spelling of 29997917 in words is "twenty-nine million, nine hundred ninety-seven thousand, nine hundred seventeen".