1385257 has 4 divisors (see below), whose sum is σ = 1399636. Its totient is φ = 1370880.

The previous prime is 1385213. The next prime is 1385273. The reversal of 1385257 is 7525831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7525831 = 977 ⋅7703.

It can be written as a sum of positive squares in 2 ways, for example, as 184041 + 1201216 = 429^2 + 1096^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385257 - 2¹¹ = 1383209 is a prime.

It is a Duffinian number.

1385257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1385287) 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, 7044 + ... + 7237.

It is an arithmetic number, because the mean of its divisors is an integer number (349909).

2^1385257 is an apocalyptic number.

It is an amenable number.

1385257 is a deficient number, since it is larger than the sum of its proper divisors (14379).

1385257 is an equidigital number, since it uses as much as digits as its factorization.

1385257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14378.

The product of its digits is 8400, while the sum is 31.

The square root of 1385257 is about 1176.9694133664. The cubic root of 1385257 is about 111.4748212097.

The spelling of 1385257 in words is "one million, three hundred eighty-five thousand, two hundred fifty-seven".