1312457 has 4 divisors (see below), whose sum is σ = 1314756. Its totient is φ = 1310160.

The previous prime is 1312411. The next prime is 1312459. The reversal of 1312457 is 7542131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 383161 = 964^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312457 - 2⁶ = 1312393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312459) 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, 443 + ... + 1679.

It is an arithmetic number, because the mean of its divisors is an integer number (328689).

2^1312457 is an apocalyptic number.

It is an amenable number.

1312457 is a deficient number, since it is larger than the sum of its proper divisors (2299).

1312457 is a wasteful number, since it uses less digits than its factorization.

1312457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298.

The product of its digits is 840, while the sum is 23.

The square root of 1312457 is about 1145.6251568467. The cubic root of 1312457 is about 109.4867828059.

Adding to 1312457 its reverse (7542131), we get a palindrome (8854588).

The spelling of 1312457 in words is "one million, three hundred twelve thousand, four hundred fifty-seven".