990927440 has 40 divisors (see below), whose sum is σ = 2306980320. Its totient is φ = 395842176.

The previous prime is 990927409. The next prime is 990927449. The reversal of 990927440 is 44729099.

It is a Cunningham number, because it is equal to 31479²-1.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 990927391 and 990927400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990927449) 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, 55091 + ... + 70829.

It is an arithmetic number, because the mean of its divisors is an integer number (57674508).

Almost surely, 2^990927440 is an apocalyptic number.

It is an amenable number.

990927440 is an abundant number, since it is smaller than the sum of its proper divisors (1316052880).

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

990927440 is a wasteful number, since it uses less digits than its factorization.

990927440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16539 (or 16533 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 990927440 is about 31478.9999841164. Note that the first 4 decimals coincide. The cubic root of 990927440 is about 996.9666212505.

The spelling of 990927440 in words is "nine hundred ninety million, nine hundred twenty-seven thousand, four hundred forty".