13971397 has 16 divisors (see below), whose sum is σ = 15685632. Its totient is φ = 12337920.

The previous prime is 13971389. The next prime is 13971407. The reversal of 13971397 is 79317931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13971397 - 2³ = 13971389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13971317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101913 + ... + 102049.

It is an arithmetic number, because the mean of its divisors is an integer number (980352).

Almost surely, 2^13971397 is an apocalyptic number.

It is an amenable number.

13971397 is a deficient number, since it is larger than the sum of its proper divisors (1714235).

13971397 is a wasteful number, since it uses less digits than its factorization.

13971397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 35721, while the sum is 40.

The square root of 13971397 is about 3737.8331958502. The cubic root of 13971397 is about 240.8499780830.

The spelling of 13971397 in words is "thirteen million, nine hundred seventy-one thousand, three hundred ninety-seven".