390728346 has 8 divisors (see below), whose sum is σ = 781456704. Its totient is φ = 130242780.

The previous prime is 390728333. The next prime is 390728353. The reversal of 390728346 is 643827093.

It is a sphenic number, since it is the product of 3 distinct primes.

390728346 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 390728298 and 390728307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32560690 + ... + 32560701.

It is an arithmetic number, because the mean of its divisors is an integer number (97682088).

Almost surely, 2^390728346 is an apocalyptic number.

390728346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

390728346 is a wasteful number, since it uses less digits than its factorization.

390728346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65121396.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 390728346 is about 19766.8496731270. The cubic root of 390728346 is about 731.0688951168.

The spelling of 390728346 in words is "three hundred ninety million, seven hundred twenty-eight thousand, three hundred forty-six".