1385038640 has 20 divisors (see below), whose sum is σ = 3220215024. Its totient is φ = 554015424.

The previous prime is 1385038621. The next prime is 1385038651. The reversal of 1385038640 is 468305831.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1385038594 and 1385038603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8656412 + ... + 8656571.

Almost surely, 2^1385038640 is an apocalyptic number.

1385038640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1385038640 is an abundant number, since it is smaller than the sum of its proper divisors (1835176384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1385038640 is a wasteful number, since it uses less digits than its factorization.

1385038640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17312996 (or 17312990 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 1385038640 is about 37216.1072655376. The cubic root of 1385038640 is about 1114.6896359119.

The spelling of 1385038640 in words is "one billion, three hundred eighty-five million, thirty-eight thousand, six hundred forty".