999240885909 has 18 divisors (see below), whose sum is σ = 1678996591350. Its totient is φ = 570994791696.

The previous prime is 999240885901. The next prime is 999240885941. The reversal of 999240885909 is 909588042999.

999240885909 is a `hidden beast` number, since 9 + 9 + 9 + 24 + 0 + 8 + 8 + 590 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 799632985284 + 199607900625 = 894222^2 + 446775^2 .

It is not a de Polignac number, because 999240885909 - 2³ = 999240885901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999240885901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1132925734 + ... + 1132926615.

Almost surely, 2^999240885909 is an apocalyptic number.

It is an amenable number.

999240885909 is a deficient number, since it is larger than the sum of its proper divisors (679755705441).

999240885909 is a wasteful number, since it uses less digits than its factorization.

999240885909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265852369 (or 2265852359 counting only the distinct ones).

The product of its (nonzero) digits is 151165440, while the sum is 72.

The spelling of 999240885909 in words is "nine hundred ninety-nine billion, two hundred forty million, eight hundred eighty-five thousand, nine hundred nine".