390883993672321 has 8 divisors (see below), whose sum is σ = 391051887502824. Its totient is φ = 390716111594880.

The previous prime is 390883993672279. The next prime is 390883993672331. The reversal of 390883993672321 is 123276399388093.

It can be written as a sum of positive squares in 4 ways, for example, as 40705229404225 + 350178764268096 = 6380065^2 + 18713064^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390883993672321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390883993672331) 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, 63918621 + ... + 69766453.

It is an arithmetic number, because the mean of its divisors is an integer number (48881485937853).

Almost surely, 2^{390883993672321} is an apocalyptic number.

It is an amenable number.

390883993672321 is a deficient number, since it is larger than the sum of its proper divisors (167893830503).

390883993672321 is a wasteful number, since it uses less digits than its factorization.

390883993672321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876531.

The product of its (nonzero) digits is 634894848, while the sum is 73.

The spelling of 390883993672321 in words is "three hundred ninety trillion, eight hundred eighty-three billion, nine hundred ninety-three million, six hundred seventy-two thousand, three hundred twenty-one".