9814396781 has 32 divisors (see below), whose sum is σ = 11943106560. Its totient is φ = 7878136896.

The previous prime is 9814396751. The next prime is 9814396793. The reversal of 9814396781 is 1876934189.

It is a de Polignac number, because none of the positive numbers 2^k-9814396781 is a prime.

It is a super-4 number, since 4×9814396781⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9814396751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4374446 + ... + 4376688.

It is an arithmetic number, because the mean of its divisors is an integer number (373222080).

Almost surely, 2^9814396781 is an apocalyptic number.

It is an amenable number.

9814396781 is a deficient number, since it is larger than the sum of its proper divisors (2128709779).

9814396781 is a wasteful number, since it uses less digits than its factorization.

9814396781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633.

The product of its digits is 2612736, while the sum is 56.

The square root of 9814396781 is about 99067.6374049568. The cubic root of 9814396781 is about 2141.0223650939.

The spelling of 9814396781 in words is "nine billion, eight hundred fourteen million, three hundred ninety-six thousand, seven hundred eighty-one".