11993391 has 18 divisors (see below), whose sum is σ = 17696952. Its totient is φ = 7825440.

The previous prime is 11993383. The next prime is 11993407. The reversal of 11993391 is 19339911.

11993391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11993391 - 2³ = 11993383 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11993341) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 87475 + ... + 87611.

It is an arithmetic number, because the mean of its divisors is an integer number (983164).

Almost surely, 2^11993391 is an apocalyptic number.

11993391 is a deficient number, since it is larger than the sum of its proper divisors (5703561).

11993391 is an equidigital number, since it uses as much as digits as its factorization.

11993391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 211 counting only the distinct ones).

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

The square root of 11993391 is about 3463.1475567755. The cubic root of 11993391 is about 228.9008107010.

The spelling of 11993391 in words is "eleven million, nine hundred ninety-three thousand, three hundred ninety-one".