11780391 has 16 divisors (see below), whose sum is σ = 18206208. Its totient is φ = 6636000.

The previous prime is 11780383. The next prime is 11780411. The reversal of 11780391 is 19308711.

11780391 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 11780391 - 2³ = 11780383 is a prime.

It is a super-2 number, since 2×11780391² = 277555224225762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11780191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2460 + ... + 5441.

It is an arithmetic number, because the mean of its divisors is an integer number (1137888).

Almost surely, 2^11780391 is an apocalyptic number.

11780391 is a deficient number, since it is larger than the sum of its proper divisors (6425817).

11780391 is an equidigital number, since it uses as much as digits as its factorization.

11780391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7982.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 11780391 is about 3432.2574204159. The cubic root of 11780391 is about 227.5376325460.

It can be divided in two parts, 117 and 80391, that added together give a palindrome (80508).

The spelling of 11780391 in words is "eleven million, seven hundred eighty thousand, three hundred ninety-one".