11940781 has 4 divisors (see below), whose sum is σ = 12032064. Its totient is φ = 11849500.

The previous prime is 11940763. The next prime is 11940787. The reversal of 11940781 is 18704911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11940781 - 2⁷ = 11940653 is a prime.

It is a super-2 number, since 2×11940781² = 285164501779922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11940787) 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, 45445 + ... + 45706.

It is an arithmetic number, because the mean of its divisors is an integer number (3008016).

Almost surely, 2^11940781 is an apocalyptic number.

It is an amenable number.

11940781 is a deficient number, since it is larger than the sum of its proper divisors (91283).

11940781 is an equidigital number, since it uses as much as digits as its factorization.

11940781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91282.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 11940781 is about 3455.5435173066. The cubic root of 11940781 is about 228.5656226762.

It can be divided in two parts, 11940 and 781, that added together give a palindrome (12721).

The spelling of 11940781 in words is "eleven million, nine hundred forty thousand, seven hundred eighty-one".