992721990 has 128 divisors (see below), whose sum is σ = 2670538752. Its totient is φ = 234524160.

The previous prime is 992721973. The next prime is 992722001. The reversal of 992721990 is 99127299.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1897869 + ... + 1898391.

It is an arithmetic number, because the mean of its divisors is an integer number (20863584).

Almost surely, 2^992721990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 992721990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335269376).

992721990 is an abundant number, since it is smaller than the sum of its proper divisors (1677816762).

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

992721990 is a wasteful number, since it uses less digits than its factorization.

992721990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734.

The product of its (nonzero) digits is 183708, while the sum is 48.

The square root of 992721990 is about 31507.4910140430. The cubic root of 992721990 is about 997.5680872614.

The spelling of 992721990 in words is "nine hundred ninety-two million, seven hundred twenty-one thousand, nine hundred ninety".