389401581 has 8 divisors (see below), whose sum is σ = 519308064. Its totient is φ = 259548080.

The previous prime is 389401577. The next prime is 389401601. The reversal of 389401581 is 185104983.

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 389401581 - 2² = 389401577 is a prime.

It is a super-3 number, since 3×389401581³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389401511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9475 + ... + 29471.

It is an arithmetic number, because the mean of its divisors is an integer number (64913508).

Almost surely, 2^389401581 is an apocalyptic number.

It is an amenable number.

389401581 is a deficient number, since it is larger than the sum of its proper divisors (129906483).

389401581 is a wasteful number, since it uses less digits than its factorization.

389401581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26491.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 389401581 is about 19733.2607797090. The cubic root of 389401581 is about 730.2404793505.

The spelling of 389401581 in words is "three hundred eighty-nine million, four hundred one thousand, five hundred eighty-one".