390891521338 has 8 divisors (see below), whose sum is σ = 586344578688. Its totient is φ = 195443328444.

The previous prime is 390891521323. The next prime is 390891521353. The reversal of 390891521338 is 833125198093.

It is an interprime number because it is at equal distance from previous prime (390891521323) and next prime (390891521353).

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

It is a super-2 number, since 2×390891521338² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1008106 + ... + 1340917.

It is an arithmetic number, because the mean of its divisors is an integer number (73293072336).

Almost surely, 2^390891521338 is an apocalyptic number.

390891521338 is a deficient number, since it is larger than the sum of its proper divisors (195453057350).

390891521338 is a wasteful number, since it uses less digits than its factorization.

390891521338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432228.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 390891521338 in words is "three hundred ninety billion, eight hundred ninety-one million, five hundred twenty-one thousand, three hundred thirty-eight".