9994400785 has 8 divisors (see below), whose sum is σ = 12016846440. Its totient is φ = 7979810304.

The previous prime is 9994400771. The next prime is 9994400813. The reversal of 9994400785 is 5870044999.

It is a Cunningham number, because it is equal to 99972²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 381186576 + 9613214209 = 19524^2 + 98047^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9994400785 is a prime.

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, 1960992 + ... + 1966081.

It is an arithmetic number, because the mean of its divisors is an integer number (1502105805).

Almost surely, 2^9994400785 is an apocalyptic number.

It is an amenable number.

9994400785 is a deficient number, since it is larger than the sum of its proper divisors (2022445655).

9994400785 is a wasteful number, since it uses less digits than its factorization.

9994400785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927587.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 9994400785 is about 99972.0000050014. Note that the first 5 decimals coincide. The cubic root of 9994400785 is about 2154.0325101917.

The spelling of 9994400785 in words is "nine billion, nine hundred ninety-four million, four hundred thousand, seven hundred eighty-five".