1385812818 has 48 divisors (see below), whose sum is σ = 3238511640. Its totient is φ = 425751552.

The previous prime is 1385812807. The next prime is 1385812829. The reversal of 1385812818 is 8182185831.

1385812818 is a `hidden beast` number, since 1 + 38 + 581 + 28 + 18 = 666.

It is an interprime number because it is at equal distance from previous prime (1385812807) and next prime (1385812829).

It can be written as a sum of positive squares in 4 ways, for example, as 793717929 + 592094889 = 28173^2 + 24333^2 .

It is a super-2 number, since 2×1385812818² = 3840954333066202248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161730 + ... + 170082.

Almost surely, 2^1385812818 is an apocalyptic number.

1385812818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1385812818 is an abundant number, since it is smaller than the sum of its proper divisors (1852698822).

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

1385812818 is a wasteful number, since it uses less digits than its factorization.

1385812818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9083 (or 9080 counting only the distinct ones).

The product of its digits is 122880, while the sum is 45.

The square root of 1385812818 is about 37226.5069271883. The cubic root of 1385812818 is about 1114.8972853426.

The spelling of 1385812818 in words is "one billion, three hundred eighty-five million, eight hundred twelve thousand, eight hundred eighteen".