11981783 has 6 divisors (see below), whose sum is σ = 13170192. Its totient is φ = 10892420.

The previous prime is 11981777. The next prime is 11981791. The reversal of 11981783 is 38718911.

It is not a de Polignac number, because 11981783 - 2²⁰ = 10933207 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 (11981713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49391 + ... + 49632.

It is an arithmetic number, because the mean of its divisors is an integer number (2195032).

Almost surely, 2^11981783 is an apocalyptic number.

11981783 is a deficient number, since it is larger than the sum of its proper divisors (1188409).

11981783 is an equidigital number, since it uses as much as digits as its factorization.

11981783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99045 (or 99034 counting only the distinct ones).

The product of its digits is 12096, while the sum is 38.

The square root of 11981783 is about 3461.4712190050. The cubic root of 11981783 is about 228.8269383963.

The spelling of 11981783 in words is "eleven million, nine hundred eighty-one thousand, seven hundred eighty-three".