1385845973 has 4 divisors (see below), whose sum is σ = 1385986560. Its totient is φ = 1385705388.

The previous prime is 1385845963. The next prime is 1385846003. The reversal of 1385845973 is 3795485831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3795485831 = 103 ⋅36849377.

It is a cyclic number.

It is not a de Polignac number, because 1385845973 - 2²⁸ = 1117410517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385845913) 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, 54293 + ... + 75626.

It is an arithmetic number, because the mean of its divisors is an integer number (346496640).

Almost surely, 2^1385845973 is an apocalyptic number.

It is an amenable number.

1385845973 is a deficient number, since it is larger than the sum of its proper divisors (140587).

1385845973 is a wasteful number, since it uses less digits than its factorization.

1385845973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140586.

The product of its digits is 3628800, while the sum is 53.

The square root of 1385845973 is about 37226.9522389357. The cubic root of 1385845973 is about 1114.9061764243.

The spelling of 1385845973 in words is "one billion, three hundred eighty-five million, eight hundred forty-five thousand, nine hundred seventy-three".