1278257 has 4 divisors (see below), whose sum is σ = 1309476. Its totient is φ = 1247040.

The previous prime is 1278253. The next prime is 1278287. The reversal of 1278257 is 7528721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 817216 = 679^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278257 - 2² = 1278253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278253) 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, 15548 + ... + 15629.

It is an arithmetic number, because the mean of its divisors is an integer number (327369).

2^1278257 is an apocalyptic number.

It is an amenable number.

1278257 is a deficient number, since it is larger than the sum of its proper divisors (31219).

1278257 is an equidigital number, since it uses as much as digits as its factorization.

1278257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31218.

The product of its digits is 7840, while the sum is 32.

The square root of 1278257 is about 1130.6002830355. The cubic root of 1278257 is about 108.5273986319.

The spelling of 1278257 in words is "one million, two hundred seventy-eight thousand, two hundred fifty-seven".