389686481 has 2 divisors, whose sum is σ = 389686482. Its totient is φ = 389686480.

The previous prime is 389686477. The next prime is 389686487. The reversal of 389686481 is 184686983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315382081 + 74304400 = 17759^2 + 8620^2 .

It is a cyclic number.

It is not a de Polignac number, because 389686481 - 2² = 389686477 is a prime.

It is a super-2 number, since 2×389686481² = 303711106948326722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (389686487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194843240 + 194843241.

It is an arithmetic number, because the mean of its divisors is an integer number (194843241).

Almost surely, 2^389686481 is an apocalyptic number.

It is an amenable number.

389686481 is a deficient number, since it is larger than the sum of its proper divisors (1).

389686481 is an equidigital number, since it uses as much as digits as its factorization.

389686481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 53.

The square root of 389686481 is about 19740.4782363549. The cubic root of 389686481 is about 730.4185258759.

It can be divided in two parts, 38 and 9686481, that multiplied together give a triangular number (368086278 = T₂₇₁₃₂).

The spelling of 389686481 in words is "three hundred eighty-nine million, six hundred eighty-six thousand, four hundred eighty-one".