1385611973 has 2 divisors, whose sum is σ = 1385611974. Its totient is φ = 1385611972.

The previous prime is 1385611963. The next prime is 1385612003. The reversal of 1385611973 is 3791165831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1385477284 + 134689 = 37222^2 + 367^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385611973 - 2²⁴ = 1368834757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1385611963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692805986 + 692805987.

It is an arithmetic number, because the mean of its divisors is an integer number (692805987).

Almost surely, 2^1385611973 is an apocalyptic number.

It is an amenable number.

1385611973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385611973 is an equidigital number, since it uses as much as digits as its factorization.

1385611973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 1385611973 is about 37223.8092220557. The cubic root of 1385611973 is about 1114.8434222810.

The spelling of 1385611973 in words is "one billion, three hundred eighty-five million, six hundred eleven thousand, nine hundred seventy-three".