390821274 has 64 divisors (see below), whose sum is σ = 885600000. Its totient is φ = 129330432.

The previous prime is 390821257. The next prime is 390821303. The reversal of 390821274 is 472128093.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 870202 + ... + 870650.

It is an arithmetic number, because the mean of its divisors is an integer number (13837500).

Almost surely, 2^390821274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390821274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (442800000).

390821274 is an abundant number, since it is smaller than the sum of its proper divisors (494778726).

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

390821274 is an equidigital number, since it uses as much as digits as its factorization.

390821274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 390821274 is about 19769.2001355644. The cubic root of 390821274 is about 731.1268478998.

The spelling of 390821274 in words is "three hundred ninety million, eight hundred twenty-one thousand, two hundred seventy-four".