11992391 has 4 divisors (see below), whose sum is σ = 12039312. Its totient is φ = 11945472.

The previous prime is 11992373. The next prime is 11992411. The reversal of 11992391 is 19329911.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11992391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11992291) 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, 23075 + ... + 23588.

It is an arithmetic number, because the mean of its divisors is an integer number (3009828).

Almost surely, 2^11992391 is an apocalyptic number.

11992391 is a deficient number, since it is larger than the sum of its proper divisors (46921).

11992391 is an equidigital number, since it uses as much as digits as its factorization.

11992391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46920.

The product of its digits is 4374, while the sum is 35.

The square root of 11992391 is about 3463.0031764352. The cubic root of 11992391 is about 228.8944486645.

The spelling of 11992391 in words is "eleven million, nine hundred ninety-two thousand, three hundred ninety-one".