13402657 has 4 divisors (see below), whose sum is σ = 14108080. Its totient is φ = 12697236.

The previous prime is 13402651. The next prime is 13402673. The reversal of 13402657 is 75620431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75620431 = 107 ⋅706733.

It is a cyclic number.

It is not a de Polignac number, because 13402657 - 2²³ = 5014049 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (13402651) 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, 352683 + ... + 352720.

It is an arithmetic number, because the mean of its divisors is an integer number (3527020).

Almost surely, 2^13402657 is an apocalyptic number.

It is an amenable number.

13402657 is a deficient number, since it is larger than the sum of its proper divisors (705423).

13402657 is an equidigital number, since it uses as much as digits as its factorization.

13402657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705422.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 13402657 is about 3660.9639441000. The cubic root of 13402657 is about 237.5364715920.

The spelling of 13402657 in words is "thirteen million, four hundred two thousand, six hundred fifty-seven".