1385308973 has 4 divisors (see below), whose sum is σ = 1414783680. Its totient is φ = 1355834268.

The previous prime is 1385308961. The next prime is 1385308979. The reversal of 1385308973 is 3798035831.

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: 3798035831 = 47 ⋅80809273.

It is a cyclic number.

It is not a de Polignac number, because 1385308973 - 2⁴ = 1385308957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 29474659 = 1385308973 / (1 + 3 + 8 + 5 + 3 + 0 + 8 + 9 + 7 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385308979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14737283 + ... + 14737376.

It is an arithmetic number, because the mean of its divisors is an integer number (353695920).

Almost surely, 2^1385308973 is an apocalyptic number.

It is an amenable number.

1385308973 is a deficient number, since it is larger than the sum of its proper divisors (29474707).

1385308973 is an equidigital number, since it uses as much as digits as its factorization.

1385308973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29474706.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1385308973 is about 37219.7390238029. The cubic root of 1385308973 is about 1114.7621532126.

The spelling of 1385308973 in words is "one billion, three hundred eighty-five million, three hundred eight thousand, nine hundred seventy-three".