991985446 has 16 divisors (see below), whose sum is σ = 1574546688. Its totient is φ = 467744200.

The previous prime is 991985441. The next prime is 991985537. The reversal of 991985446 is 644589199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991985441) 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, 148600 + ... + 155131.

It is an arithmetic number, because the mean of its divisors is an integer number (98409168).

Almost surely, 2^991985446 is an apocalyptic number.

991985446 is a deficient number, since it is larger than the sum of its proper divisors (582561242).

991985446 is a wasteful number, since it uses less digits than its factorization.

991985446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303827.

The product of its digits is 2799360, while the sum is 55.

The square root of 991985446 is about 31495.8004502188. The cubic root of 991985446 is about 997.3213130430.

The spelling of 991985446 in words is "nine hundred ninety-one million, nine hundred eighty-five thousand, four hundred forty-six".