9993931 has 4 divisors (see below), whose sum is σ = 10226392.
Its totient is φ = 9761472.
The previous prime is 9993923. The next prime is 9993941. The reversal of 9993931 is 1393999.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 9993931 - 23 = 9993923 is a prime.
It is a super-2 number, since 2×99939312 = 199757313665522, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 232417 = 9993931 / (9 + 9 + 9 + 3 + 9 + 3 + 1).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (9993901) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116166 + ... + 116251.
It is an arithmetic number, because the mean of its divisors is an integer number (2556598).
Almost surely, 29993931 is an apocalyptic number.
9993931 is a deficient number, since it is larger than the sum of its proper divisors (232461).
9993931 is a wasteful number, since it uses less digits than its factorization.
9993931 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 232460.
The product of its digits is 59049, while the sum is 43.
The square root of 9993931 is about 3161.3179213739.
The cubic root of 9993931 is about 215.3998759693.
The spelling of 9993931 in words is "nine million, nine hundred ninety-three thousand, nine hundred thirty-one".