389731 has 8 divisors (see below), whose sum is σ = 410400. Its totient is φ = 369600.

The previous prime is 389723. The next prime is 389743. The reversal of 389731 is 137983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 389731 - 2³ = 389723 is a prime.

It is a super-2 number, since 2×389731² = 303780504722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 389693 and 389702.

It is not an unprimeable number, because it can be changed into a prime (389761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2506 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (51300).

2³⁸⁹⁷³¹ is an apocalyptic number.

389731 is a deficient number, since it is larger than the sum of its proper divisors (20669).

389731 is a wasteful number, since it uses less digits than its factorization.

389731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 4536, while the sum is 31.

The square root of 389731 is about 624.2843903222. The cubic root of 389731 is about 73.0446339914.

The spelling of 389731 in words is "three hundred eighty-nine thousand, seven hundred thirty-one".