13481397 has 14 divisors (see below), whose sum is σ = 20213942. Its totient is φ = 8987112.

The previous prime is 13481383. The next prime is 13481399. The reversal of 13481397 is 79318431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11029041 + 2452356 = 3321^2 + 1566^2 .

It is not a de Polignac number, because 13481397 - 2⁷ = 13481269 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 (13481399) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 8518 + ... + 9975.

It is an arithmetic number, because the mean of its divisors is an integer number (1443853).

Almost surely, 2^13481397 is an apocalyptic number.

It is an amenable number.

13481397 is a deficient number, since it is larger than the sum of its proper divisors (6732545).

13481397 is an frugal number, since it uses more digits than its factorization.

13481397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18511 (or 18496 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 13481397 is about 3671.7021938060. The cubic root of 13481397 is about 238.0007355861. Note that the first 3 decimals are identical.

The spelling of 13481397 in words is "thirteen million, four hundred eighty-one thousand, three hundred ninety-seven".