13897997 has 2 divisors, whose sum is σ = 13897998. Its totient is φ = 13897996.

The previous prime is 13897943. The next prime is 13897999. The reversal of 13897997 is 79979831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 2735716 = 3341^2 + 1654^2 .

It is an emirp because it is prime and its reverse (79979831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13897997 - 2¹⁴ = 13881613 is a prime.

It is a super-2 number, since 2×13897997² = 386308641224018, which contains 22 as substring.

Together with 13897999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13897999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6948998 + 6948999.

It is an arithmetic number, because the mean of its divisors is an integer number (6948999).

Almost surely, 2^13897997 is an apocalyptic number.

It is an amenable number.

13897997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13897997 is an equidigital number, since it uses as much as digits as its factorization.

13897997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 53.

The square root of 13897997 is about 3728.0017435618. The cubic root of 13897997 is about 240.4274615801.

The spelling of 13897997 in words is "thirteen million, eight hundred ninety-seven thousand, nine hundred ninety-seven".