991946004 has 36 divisors (see below), whose sum is σ = 2692426464. Its totient is φ = 283412976.

The previous prime is 991946003. The next prime is 991946057. The reversal of 991946004 is 400649199.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991946003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 842904 + ... + 844079.

It is an arithmetic number, because the mean of its divisors is an integer number (74789624).

Almost surely, 2^991946004 is an apocalyptic number.

It is an amenable number.

991946004 is an abundant number, since it is smaller than the sum of its proper divisors (1700480460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991946004 is a wasteful number, since it uses less digits than its factorization.

991946004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687004 (or 1686995 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 991946004 is about 31495.1742970253. The cubic root of 991946004 is about 997.3080948153.

The spelling of 991946004 in words is "nine hundred ninety-one million, nine hundred forty-six thousand, four".