13478657 has 6 divisors (see below), whose sum is σ = 14225778. Its totient is φ = 12768912.

The previous prime is 13478653. The next prime is 13478669. The reversal of 13478657 is 75687431.

13478657 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12222016 + 1256641 = 3496^2 + 1121^2 .

It is not a de Polignac number, because 13478657 - 2² = 13478653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13478653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18308 + ... + 19029.

It is an arithmetic number, because the mean of its divisors is an integer number (2370963).

Almost surely, 2^13478657 is an apocalyptic number.

It is an amenable number.

13478657 is a deficient number, since it is larger than the sum of its proper divisors (747121).

13478657 is an equidigital number, since it uses as much as digits as its factorization.

13478657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37375 (or 37356 counting only the distinct ones).

The product of its digits is 141120, while the sum is 41.

The square root of 13478657 is about 3671.3290509024. The cubic root of 13478657 is about 237.9846104966.

The spelling of 13478657 in words is "thirteen million, four hundred seventy-eight thousand, six hundred fifty-seven".