389992681 has 12 divisors (see below), whose sum is σ = 427403088. Its totient is φ = 355643184.

The previous prime is 389992663. The next prime is 389992693. The reversal of 389992681 is 186299983.

It is not a de Polignac number, because 389992681 - 2¹⁷ = 389861609 is a prime.

It is a super-2 number, since 2×389992681² = 304188582467135522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389992601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126 + ... + 27928.

It is an arithmetic number, because the mean of its divisors is an integer number (35616924).

Almost surely, 2^389992681 is an apocalyptic number.

It is an amenable number.

389992681 is a deficient number, since it is larger than the sum of its proper divisors (37410407).

389992681 is a wasteful number, since it uses less digits than its factorization.

389992681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27912 (or 27899 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 55.

The square root of 389992681 is about 19748.2323512764. The cubic root of 389992681 is about 730.6097869790.

It can be divided in two parts, 3899 and 92681, that added together give a triangular number (96580 = T₄₃₉).

The spelling of 389992681 in words is "three hundred eighty-nine million, nine hundred ninety-two thousand, six hundred eighty-one".