1379857 has 2 divisors, whose sum is σ = 1379858. Its totient is φ = 1379856.

The previous prime is 1379821. The next prime is 1379867. The reversal of 1379857 is 7589731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 938961 + 440896 = 969^2 + 664^2 .

It is an emirp because it is prime and its reverse (7589731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1379857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1379867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689928 + 689929.

It is an arithmetic number, because the mean of its divisors is an integer number (689929).

2^1379857 is an apocalyptic number.

It is an amenable number.

1379857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379857 is an equidigital number, since it uses as much as digits as its factorization.

1379857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 40.

The square root of 1379857 is about 1174.6731460283. The cubic root of 1379857 is about 111.3297824374.

The spelling of 1379857 in words is "one million, three hundred seventy-nine thousand, eight hundred fifty-seven".