9993400385 has 4 divisors (see below), whose sum is σ = 11992080468. Its totient is φ = 7994720304.

The previous prime is 9993400367. The next prime is 9993400397. The reversal of 9993400385 is 5830043999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7398924289 + 2594476096 = 86017^2 + 50936^2 .

It is a cyclic number.

It is not a de Polignac number, because 9993400385 - 2¹⁶ = 9993334849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999340034 + ... + 999340043.

It is an arithmetic number, because the mean of its divisors is an integer number (2998020117).

Almost surely, 2^9993400385 is an apocalyptic number.

It is an amenable number.

9993400385 is a deficient number, since it is larger than the sum of its proper divisors (1998680083).

9993400385 is a wasteful number, since it uses less digits than its factorization.

9993400385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998680082.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 9993400385 is about 99966.9964788380. The cubic root of 9993400385 is about 2153.9606377479.

The spelling of 9993400385 in words is "nine billion, nine hundred ninety-three million, four hundred thousand, three hundred eighty-five".