999999940 has 24 divisors (see below), whose sum is σ = 2101827672.
Its totient is φ = 399651840.
The previous prime is 999999937. The next prime is 1000000007. The reversal of 999999940 is 49999999.
It can be written as a sum of positive squares in 4 ways, for example, as 460274116 + 539725824 = 21454^2 + 23232^2
It is a nialpdrome in base 10.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2452 + ... + 44788.
It is an arithmetic number, because the mean of its divisors is an integer number (87576153).
Almost surely, 2999999940 is an apocalyptic number.
It is an amenable number.
999999940 is an abundant number, since it is smaller than the sum of its proper divisors (1101827732).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
999999940 is a wasteful number, since it uses less digits than its factorization.
999999940 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 43527 (or 43525 counting only the distinct ones).
The product of its (nonzero) digits is 19131876, while the sum is 67.
The square root of 999999940 is about 31622.7756530005.
The cubic root of 999999940 is about 999.9999800000.
Note that the first 4 decimals are identical.
The spelling of 999999940 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty".