1385811000 has 192 divisors, whose sum is σ = 5353433280. Its totient is φ = 316742400.

The previous prime is 1385810989. The next prime is 1385811013. The reversal of 1385811000 is 1185831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52002 + ... + 73998.

It is an arithmetic number, because the mean of its divisors is an integer number (27882465).

Almost surely, 2^1385811000 is an apocalyptic number.

1385811000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1385811000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2676716640).

1385811000 is an abundant number, since it is smaller than the sum of its proper divisors (3967622280).

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

1385811000 is a wasteful number, since it uses less digits than its factorization.

1385811000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22031 (or 22014 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1385811000 is about 37226.4825090956. The cubic root of 1385811000 is about 1114.8967978107.

Adding to 1385811000 its reverse (1185831), we get a palindrome (1386996831).

The spelling of 1385811000 in words is "one billion, three hundred eighty-five million, eight hundred eleven thousand".