13447997 has 2 divisors, whose sum is σ = 13447998. Its totient is φ = 13447996.

The previous prime is 13447963. The next prime is 13448011. The reversal of 13447997 is 79974431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10588516 + 2859481 = 3254^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 13447997 - 2⁸ = 13447741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13447927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6723998 + 6723999.

It is an arithmetic number, because the mean of its divisors is an integer number (6723999).

Almost surely, 2^13447997 is an apocalyptic number.

It is an amenable number.

13447997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13447997 is an equidigital number, since it uses as much as digits as its factorization.

13447997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 13447997 is about 3667.1510740628. The cubic root of 13447997 is about 237.8040250542.

The spelling of 13447997 in words is "thirteen million, four hundred forty-seven thousand, nine hundred ninety-seven".