1385611972 has 12 divisors (see below), whose sum is σ = 2442521340. Its totient is φ = 687748736.

The previous prime is 1385611963. The next prime is 1385611973. The reversal of 1385611972 is 2791165831.

It can be written as a sum of positive squares in 2 ways, for example, as 882327616 + 503284356 = 29704^2 + 22434^2 .

It is not an unprimeable number, because it can be changed into a prime (1385611973) 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, 1263697 + ... + 1264792.

It is an arithmetic number, because the mean of its divisors is an integer number (203543445).

Almost surely, 2^1385611972 is an apocalyptic number.

It is an amenable number.

1385611972 is a deficient number, since it is larger than the sum of its proper divisors (1056909368).

1385611972 is a wasteful number, since it uses less digits than its factorization.

1385611972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528630 (or 2528628 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 1385611972 is about 37223.8092086235. The cubic root of 1385611972 is about 1114.8434220128.

The spelling of 1385611972 in words is "one billion, three hundred eighty-five million, six hundred eleven thousand, nine hundred seventy-two".