9393489781 has 16 divisors (see below), whose sum is σ = 10768161600. Its totient is φ = 8122232448.

The previous prime is 9393489773. The next prime is 9393489881. The reversal of 9393489781 is 1879843939.

It is a cyclic number.

It is not a de Polignac number, because 9393489781 - 2³ = 9393489773 is a prime.

It is a super-2 number, since 2×9393489781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9393489751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191671 + ... + 235636.

It is an arithmetic number, because the mean of its divisors is an integer number (673010100).

Almost surely, 2^9393489781 is an apocalyptic number.

It is an amenable number.

9393489781 is a deficient number, since it is larger than the sum of its proper divisors (1374671819).

9393489781 is a wasteful number, since it uses less digits than its factorization.

9393489781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427428.

The product of its digits is 11757312, while the sum is 61.

The square root of 9393489781 is about 96920.0174422188. The cubic root of 9393489781 is about 2109.9669649598.

The spelling of 9393489781 in words is "nine billion, three hundred ninety-three million, four hundred eighty-nine thousand, seven hundred eighty-one".