1385665830 has 48 divisors (see below), whose sum is σ = 3610183824. Its totient is φ = 368746560.

The previous prime is 1385665783. The next prime is 1385665837. The reversal of 1385665830 is 385665831.

1385665830 is a `hidden beast` number, since 1 + 3 + 8 + 5 + 66 + 583 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385665837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28512 + ... + 59868.

It is an arithmetic number, because the mean of its divisors is an integer number (75212163).

Almost surely, 2^1385665830 is an apocalyptic number.

1385665830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1385665830 is an abundant number, since it is smaller than the sum of its proper divisors (2224517994).

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

1385665830 is a wasteful number, since it uses less digits than its factorization.

1385665830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31861 (or 31858 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1385665830 is about 37224.5326364214. The cubic root of 1385665830 is about 1114.8578662825.

Subtracting from 1385665830 its reverse (385665831), we obtain a palindrome (999999999).

The spelling of 1385665830 in words is "one billion, three hundred eighty-five million, six hundred sixty-five thousand, eight hundred thirty".