1384509681 has 27 divisors (see below), whose sum is σ = 2038465611. Its totient is φ = 905518224.

The previous prime is 1384509671. The next prime is 1384509683. The reversal of 1384509681 is 1869054831.

The square root of 1384509681 is 37209.

It is a perfect power (a square), and thus also a powerful number.

1384509681 is a `hidden beast` number, since 1 + 3 + 84 + 509 + 68 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 405821025 + 978688656 = 20145^2 + 31284^2 .

It is not a de Polignac number, because 1384509681 - 2¹¹ = 1384507633 is a prime.

It is a super-2 number, since 2×1384509681² = 3833734113565443522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1384509683) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8818455 + ... + 8818611.

Almost surely, 2^1384509681 is an apocalyptic number.

1384509681 is the 37209-th square number.

1384509681 is the 18605-th centered octagonal number.

It is an amenable number.

1384509681 is a deficient number, since it is larger than the sum of its proper divisors (653955930).

1384509681 is an frugal number, since it uses more digits than its factorization.

1384509681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 239 counting only the distinct ones).

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

The cubic root of 1384509681 is about 1114.5477144341.

The spelling of 1384509681 in words is "one billion, three hundred eighty-four million, five hundred nine thousand, six hundred eighty-one".