10939781 has 4 divisors (see below), whose sum is σ = 10947552. Its totient is φ = 10932012.

The previous prime is 10939777. The next prime is 10939793. The reversal of 10939781 is 18793901.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10939781 - 2² = 10939777 is a prime.

It is a super-2 number, since 2×10939781² = 239357616655922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10939771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (2736888).

Almost surely, 2^10939781 is an apocalyptic number.

It is an amenable number.

10939781 is a deficient number, since it is larger than the sum of its proper divisors (7771).

10939781 is an equidigital number, since it uses as much as digits as its factorization.

10939781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 10939781 is about 3307.5339756380. The cubic root of 10939781 is about 221.9914302890.

The spelling of 10939781 in words is "ten million, nine hundred thirty-nine thousand, seven hundred eighty-one".