1385622857 has 2 divisors, whose sum is σ = 1385622858. Its totient is φ = 1385622856.

The previous prime is 1385622853. The next prime is 1385622911. The reversal of 1385622857 is 7582265831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1365228601 + 20394256 = 36949^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385622857 - 2² = 1385622853 is a prime.

It is not a weakly prime, because it can be changed into another prime (1385622853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692811428 + 692811429.

It is an arithmetic number, because the mean of its divisors is an integer number (692811429).

Almost surely, 2^1385622857 is an apocalyptic number.

It is an amenable number.

1385622857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385622857 is an equidigital number, since it uses as much as digits as its factorization.

1385622857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 47.

The square root of 1385622857 is about 37223.9554185205. The cubic root of 1385622857 is about 1114.8463413099.

The spelling of 1385622857 in words is "one billion, three hundred eighty-five million, six hundred twenty-two thousand, eight hundred fifty-seven".