389205421 has 16 divisors (see below), whose sum is σ = 429347520. Its totient is φ = 349879680.

The previous prime is 389205409. The next prime is 389205431. The reversal of 389205421 is 124502983.

It is not a de Polignac number, because 389205421 - 2¹³ = 389197229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389205431) 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 15 ways as a sum of consecutive naturals, for example, 698475 + ... + 699031.

It is an arithmetic number, because the mean of its divisors is an integer number (26834220).

Almost surely, 2^389205421 is an apocalyptic number.

It is an amenable number.

389205421 is a deficient number, since it is larger than the sum of its proper divisors (40142099).

389205421 is a wasteful number, since it uses less digits than its factorization.

389205421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 389205421 is about 19728.2898650643. The cubic root of 389205421 is about 730.1178398621.

The spelling of 389205421 in words is "three hundred eighty-nine million, two hundred five thousand, four hundred twenty-one".