1378257 has 8 divisors (see below), whose sum is σ = 1865376. Its totient is φ = 904992.

The previous prime is 1378253. The next prime is 1378271. The reversal of 1378257 is 7528731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1378257 - 2² = 1378253 is a prime.

1378257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1378253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3228 + ... + 3629.

It is an arithmetic number, because the mean of its divisors is an integer number (233172).

2^1378257 is an apocalyptic number.

It is an amenable number.

1378257 is a deficient number, since it is larger than the sum of its proper divisors (487119).

1378257 is an equidigital number, since it uses as much as digits as its factorization.

1378257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6927.

The product of its digits is 11760, while the sum is 33.

The square root of 1378257 is about 1173.9919079789. The cubic root of 1378257 is about 111.2867353330.

The spelling of 1378257 in words is "one million, three hundred seventy-eight thousand, two hundred fifty-seven".