1385611957 has 4 divisors (see below), whose sum is σ = 1386383116. Its totient is φ = 1384840800.

The previous prime is 1385611949. The next prime is 1385611963. The reversal of 1385611957 is 7591165831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7591165831 = 29 ⋅261764339.

It can be written as a sum of positive squares in 2 ways, for example, as 446434641 + 939177316 = 21129^2 + 30646^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385611957 - 2³ = 1385611949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385611937) 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, 382878 + ... + 386479.

It is an arithmetic number, because the mean of its divisors is an integer number (346595779).

Almost surely, 2^1385611957 is an apocalyptic number.

It is an amenable number.

1385611957 is a deficient number, since it is larger than the sum of its proper divisors (771159).

1385611957 is an equidigital number, since it uses as much as digits as its factorization.

1385611957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771158.

The product of its digits is 226800, while the sum is 46.

The square root of 1385611957 is about 37223.8090071395. The cubic root of 1385611957 is about 1114.8434179899.

The spelling of 1385611957 in words is "one billion, three hundred eighty-five million, six hundred eleven thousand, nine hundred fifty-seven".