1305257 has 4 divisors (see below), whose sum is σ = 1327440. Its totient is φ = 1283076.

The previous prime is 1305253. The next prime is 1305287. The reversal of 1305257 is 7525031.

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: 7525031 = 2309 ⋅3259.

It is a cyclic number.

It is not a de Polignac number, because 1305257 - 2² = 1305253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305251) 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, 11003 + ... + 11120.

It is an arithmetic number, because the mean of its divisors is an integer number (331860).

2^1305257 is an apocalyptic number.

It is an amenable number.

1305257 is a deficient number, since it is larger than the sum of its proper divisors (22183).

1305257 is an equidigital number, since it uses as much as digits as its factorization.

1305257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 1305257 is about 1142.4784461862. The cubic root of 1305257 is about 109.2862046118.

The spelling of 1305257 in words is "one million, three hundred five thousand, two hundred fifty-seven".