999385770240 has 432 divisors, whose sum is σ = 4062282719040. Its totient is φ = 223638405120.

The previous prime is 999385770217. The next prime is 999385770247. The reversal of 999385770240 is 42077583999.

999385770240 is a `hidden beast` number, since 9 + 9 + 9 + 38 + 577 + 0 + 24 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (999385770247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1344031 + ... + 1950689.

It is an arithmetic number, because the mean of its divisors is an integer number (9403432220).

Almost surely, 2^999385770240 is an apocalyptic number.

999385770240 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999385770240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2031141359520).

999385770240 is an abundant number, since it is smaller than the sum of its proper divisors (3062896948800).

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

999385770240 is a wasteful number, since it uses less digits than its factorization.

999385770240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606710 (or 606693 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 63.

The spelling of 999385770240 in words is "nine hundred ninety-nine billion, three hundred eighty-five million, seven hundred seventy thousand, two hundred forty".