2320781 has 4 divisors (see below), whose sum is σ = 2324064. Its totient is φ = 2317500.

The previous prime is 2320741. The next prime is 2320807. The reversal of 2320781 is 1870232.

2320781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-2320781 is a prime.

It is a super-2 number, since 2×2320781² = 10772048899922, 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 (2320741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 2156.

It is an arithmetic number, because the mean of its divisors is an integer number (581016).

2^2320781 is an apocalyptic number.

It is an amenable number.

2320781 is a deficient number, since it is larger than the sum of its proper divisors (3283).

2320781 is a wasteful number, since it uses less digits than its factorization.

2320781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2320781 is about 1523.4109754101. The cubic root of 2320781 is about 132.3969722415.

The spelling of 2320781 in words is "two million, three hundred twenty thousand, seven hundred eighty-one".