999961938 has 48 divisors (see below), whose sum is σ = 2267104320. Its totient is φ = 317937312.

The previous prime is 999961931. The next prime is 999961939. The reversal of 999961938 is 839169999.

999961938 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 619 + 3 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (999961931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153720 + ... + 160092.

It is an arithmetic number, because the mean of its divisors is an integer number (47231340).

Almost surely, 2^999961938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999961938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1133552160).

999961938 is an abundant number, since it is smaller than the sum of its proper divisors (1267142382).

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

999961938 is a wasteful number, since it uses less digits than its factorization.

999961938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6783 (or 6780 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 63.

The square root of 999961938 is about 31622.1747828956. The cubic root of 999961938 is about 999.9873125057.

The spelling of 999961938 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred thirty-eight".