991494460 has 48 divisors (see below), whose sum is σ = 2288829312. Its totient is φ = 357780800.

The previous prime is 991494437. The next prime is 991494523. The reversal of 991494460 is 64494199.

It is a super-2 number, since 2×991494460² = 1966122528421383200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 991494460.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11619 + ... + 46021.

It is an arithmetic number, because the mean of its divisors is an integer number (47683944).

Almost surely, 2^991494460 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991494460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1144414656).

991494460 is an abundant number, since it is smaller than the sum of its proper divisors (1297334852).

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

991494460 is a wasteful number, since it uses less digits than its factorization.

991494460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34554 (or 34552 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 991494460 is about 31488.0050177842. The cubic root of 991494460 is about 997.1567435545.

The spelling of 991494460 in words is "nine hundred ninety-one million, four hundred ninety-four thousand, four hundred sixty".