989993754 has 24 divisors (see below), whose sum is σ = 2175200352. Its totient is φ = 325349640.

The previous prime is 989993747. The next prime is 989993821. The reversal of 989993754 is 457399989.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 989993691 and 989993700.

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 11 ways as a sum of consecutive naturals, for example, 386044 + ... + 388599.

It is an arithmetic number, because the mean of its divisors is an integer number (90633348).

Almost surely, 2^989993754 is an apocalyptic number.

989993754 is an abundant number, since it is smaller than the sum of its proper divisors (1185206598).

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

989993754 is a wasteful number, since it uses less digits than its factorization.

989993754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774722 (or 774719 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The square root of 989993754 is about 31464.1661894925. The cubic root of 989993754 is about 996.6533974115.

The spelling of 989993754 in words is "nine hundred eighty-nine million, nine hundred ninety-three thousand, seven hundred fifty-four".