390189220 has 24 divisors (see below), whose sum is σ = 821028600. Its totient is φ = 155764992.

The previous prime is 390189203. The next prime is 390189221. The reversal of 390189220 is 22981093.

390189220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 83028544 + 307160676 = 9112^2 + 17526^2 .

It is not an unprimeable number, because it can be changed into a prime (390189221) 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, 8985 + ... + 29344.

It is an arithmetic number, because the mean of its divisors is an integer number (34209525).

Almost surely, 2^390189220 is an apocalyptic number.

It is an amenable number.

390189220 is an abundant number, since it is smaller than the sum of its proper divisors (430839380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390189220 is a wasteful number, since it uses less digits than its factorization.

390189220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38847 (or 38845 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 390189220 is about 19753.2078407534. The cubic root of 390189220 is about 730.7324980016.

The spelling of 390189220 in words is "three hundred ninety million, one hundred eighty-nine thousand, two hundred twenty".