389681 has 4 divisors (see below), whose sum is σ = 391152. Its totient is φ = 388212.

The previous prime is 389663. The next prime is 389687. The reversal of 389681 is 186983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 389681 - 2¹⁰ = 388657 is a prime.

It is a super-2 number, since 2×389681² = 303702563522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (389687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (97788).

2³⁸⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

389681 is a deficient number, since it is larger than the sum of its proper divisors (1471).

389681 is a wasteful number, since it uses less digits than its factorization.

389681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its digits is 10368, while the sum is 35.

The square root of 389681 is about 624.2443431862. The cubic root of 389681 is about 73.0415101377.

The spelling of 389681 in words is "three hundred eighty-nine thousand, six hundred eighty-one".