390999217216 has 28 divisors (see below), whose sum is σ = 776251739340. Its totient is φ = 195408227840.

The previous prime is 390999217177. The next prime is 390999217229. The reversal of 390999217216 is 612712999093.

It can be written as a sum of positive squares in 2 ways, for example, as 206188646400 + 184810570816 = 454080^2 + 429896^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1289731 + ... + 1563778.

It is an arithmetic number, because the mean of its divisors is an integer number (27723276405).

Almost surely, 2^390999217216 is an apocalyptic number.

It is an amenable number.

390999217216 is a deficient number, since it is larger than the sum of its proper divisors (385252522124).

390999217216 is a wasteful number, since it uses less digits than its factorization.

390999217216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855662 (or 2855652 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 58.

The spelling of 390999217216 in words is "three hundred ninety billion, nine hundred ninety-nine million, two hundred seventeen thousand, two hundred sixteen".