9994200840 has 192 divisors, whose sum is σ = 35037802800. Its totient is φ = 2456027136.

The previous prime is 9994200823. The next prime is 9994200863. The reversal of 9994200840 is 480024999.

It is a Cunningham number, because it is equal to 99971²-1.

It can be written as a sum of positive squares in 8 ways, for example, as 733218084 + 9260982756 = 27078^2 + 96234^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3597532 + ... + 3600308.

Almost surely, 2^9994200840 is an apocalyptic number.

9994200840 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 9994200840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17518901400).

9994200840 is an abundant number, since it is smaller than the sum of its proper divisors (25043601960).

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

9994200840 is a wasteful number, since it uses less digits than its factorization.

9994200840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3576 (or 3569 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 9994200840 is about 99970.9999949985. Note that the first 5 decimals coincide. The cubic root of 9994200840 is about 2154.0181457854.

The spelling of 9994200840 in words is "nine billion, nine hundred ninety-four million, two hundred thousand, eight hundred forty".