2306781 has 12 divisors (see below), whose sum is σ = 3528252. Its totient is φ = 1447296.

The previous prime is 2306761. The next prime is 2306797. The reversal of 2306781 is 1876032.

It can be written as a sum of positive squares in 2 ways, for example, as 793881 + 1512900 = 891^2 + 1230^2 .

It is not a de Polignac number, because 2306781 - 2¹³ = 2298589 is a prime.

It is a super-2 number, since 2×2306781² = 10642477163922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2306761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7386 + ... + 7691.

It is an arithmetic number, because the mean of its divisors is an integer number (294021).

2^2306781 is an apocalyptic number.

It is an amenable number.

2306781 is a deficient number, since it is larger than the sum of its proper divisors (1221471).

2306781 is a wasteful number, since it uses less digits than its factorization.

2306781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15100 (or 15097 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2306781 is about 1518.8090729252. The cubic root of 2306781 is about 132.1302089811.

The spelling of 2306781 in words is "two million, three hundred six thousand, seven hundred eighty-one".