990121244 has 36 divisors (see below), whose sum is σ = 2049790680. Its totient is φ = 417140640.

The previous prime is 990121211. The next prime is 990121247. The reversal of 990121244 is 442121099.

It is a self number, because there is not a number n which added to its sum of digits gives 990121244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990121247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31247 + ... + 54374.

It is an arithmetic number, because the mean of its divisors is an integer number (56938630).

Almost surely, 2^990121244 is an apocalyptic number.

It is an amenable number.

990121244 is an abundant number, since it is smaller than the sum of its proper divisors (1059669436).

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

990121244 is a wasteful number, since it uses less digits than its factorization.

990121244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85698 (or 85689 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 990121244 is about 31466.1920797544. The cubic root of 990121244 is about 996.6961781150.

The spelling of 990121244 in words is "nine hundred ninety million, one hundred twenty-one thousand, two hundred forty-four".