991390466 has 32 divisors (see below), whose sum is σ = 1654235136. Its totient is φ = 441826000.

The previous prime is 991390457. The next prime is 991390489. The reversal of 991390466 is 664093199.

991390466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 991390466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296681 + ... + 300003.

It is an arithmetic number, because the mean of its divisors is an integer number (51694848).

Almost surely, 2^991390466 is an apocalyptic number.

991390466 is a deficient number, since it is larger than the sum of its proper divisors (662844670).

991390466 is a wasteful number, since it uses less digits than its factorization.

991390466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 991390466 is about 31486.3536472549. The cubic root of 991390466 is about 997.1218797039.

The spelling of 991390466 in words is "nine hundred ninety-one million, three hundred ninety thousand, four hundred sixty-six".