1384905681 has 20 divisors (see below), whose sum is σ = 2082712500. Its totient is φ = 917066016.

The previous prime is 1384905679. The next prime is 1384905733. The reversal of 1384905681 is 1865094831.

1384905681 is a `hidden beast` number, since 1 + 3 + 84 + 9 + 0 + 568 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 245235600 + 1139670081 = 15660^2 + 33759^2 .

It is not a de Polignac number, because 1384905681 - 2¹ = 1384905679 is a prime.

It is a super-2 number, since 2×1384905681² = 3835927490532147522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1384905281) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45306 + ... + 69443.

It is an arithmetic number, because the mean of its divisors is an integer number (104135625).

Almost surely, 2^1384905681 is an apocalyptic number.

It is an amenable number.

1384905681 is a deficient number, since it is larger than the sum of its proper divisors (697806819).

1384905681 is a wasteful number, since it uses less digits than its factorization.

1384905681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114910 (or 114901 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1384905681 is about 37214.3209127884. The cubic root of 1384905681 is about 1114.6539659656.

The spelling of 1384905681 in words is "one billion, three hundred eighty-four million, nine hundred five thousand, six hundred eighty-one".