394225021 has 8 divisors (see below), whose sum is σ = 398153664.
Its totient is φ = 390304320.
The previous prime is 394225001. The next prime is 394225031. The reversal of 394225021 is 120522493.
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 394225021 - 211 = 394222973 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 (394225001) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162306 + ... + 164716.
It is an arithmetic number, because the mean of its divisors is an integer number (49769208).
Almost surely, 2394225021 is an apocalyptic number.
It is an amenable number.
394225021 is a deficient number, since it is larger than the sum of its proper divisors (3928643).
394225021 is a wasteful number, since it uses less digits than its factorization.
394225021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3971.
The product of its (nonzero) digits is 4320, while the sum is 28.
The square root of 394225021 is about 19855.1006293093.
The cubic root of 394225021 is about 733.2432296779.
The spelling of 394225021 in words is "three hundred ninety-four million, two hundred twenty-five thousand, twenty-one".