13971797 has 4 divisors (see below), whose sum is σ = 15967776. Its totient is φ = 11975820.

The previous prime is 13971791. The next prime is 13971809. The reversal of 13971797 is 79717931.

It is a happy number.

13971797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13971797 - 2⁴ = 13971781 is a prime.

It is a super-2 number, since 2×13971797² = 390422222818418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13971791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997979 + ... + 997992.

It is an arithmetic number, because the mean of its divisors is an integer number (3991944).

Almost surely, 2^13971797 is an apocalyptic number.

It is an amenable number.

13971797 is a deficient number, since it is larger than the sum of its proper divisors (1995979).

13971797 is an equidigital number, since it uses as much as digits as its factorization.

13971797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995978.

The product of its digits is 83349, while the sum is 44.

The square root of 13971797 is about 3737.8867024028. The cubic root of 13971797 is about 240.8522765664.

The spelling of 13971797 in words is "thirteen million, nine hundred seventy-one thousand, seven hundred ninety-seven".