991382416 has 40 divisors (see below), whose sum is σ = 1954053504. Its totient is φ = 487184640.

The previous prime is 991382411. The next prime is 991382423. The reversal of 991382416 is 614283199.

It is a happy number.

991382416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (991382411) 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, 223581 + ... + 227971.

Almost surely, 2^991382416 is an apocalyptic number.

It is an amenable number.

991382416 is a deficient number, since it is larger than the sum of its proper divisors (962671088).

991382416 is a wasteful number, since it uses less digits than its factorization.

991382416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639 (or 4633 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 991382416 is about 31486.2258138380. The cubic root of 991382416 is about 997.1191808504.

It can be divided in two parts, 9913 and 82416, that added together give a palindrome (92329).

The spelling of 991382416 in words is "nine hundred ninety-one million, three hundred eighty-two thousand, four hundred sixteen".