11993913 has 10 divisors (see below), whose sum is σ = 17916954. Its totient is φ = 7995888.

The previous prime is 11993911. The next prime is 11993963. The reversal of 11993913 is 31939911.

11993913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7634169 + 4359744 = 2763^2 + 2088^2 .

It is not a de Polignac number, because 11993913 - 2¹ = 11993911 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (11993911) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 73956 + ... + 74117.

Almost surely, 2^11993913 is an apocalyptic number.

It is an amenable number.

11993913 is a deficient number, since it is larger than the sum of its proper divisors (5923041).

11993913 is an equidigital number, since it uses as much as digits as its factorization.

11993913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148085 (or 148076 counting only the distinct ones).

The product of its digits is 6561, while the sum is 36.

The square root of 11993913 is about 3463.2229209221. Note that the first 3 decimals coincide. The cubic root of 11993913 is about 228.9041315436.

The spelling of 11993913 in words is "eleven million, nine hundred ninety-three thousand, nine hundred thirteen".