3640823 has 2 divisors, whose sum is σ = 3640824. Its totient is φ = 3640822.

The previous prime is 3640817. The next prime is 3640829. The reversal of 3640823 is 3280463.

It is a balanced prime because it is at equal distance from previous prime (3640817) and next prime (3640829).

It is an emirp because it is prime and its reverse (3280463) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3640823 - 2⁴ = 3640807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3640792 and 3640801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820411 + 1820412.

It is an arithmetic number, because the mean of its divisors is an integer number (1820412).

Almost surely, 2^3640823 is an apocalyptic number.

3640823 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640823 is an equidigital number, since it uses as much as digits as its factorization.

3640823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 3640823 is about 1908.0940752489. The cubic root of 3640823 is about 153.8390261505.

The spelling of 3640823 in words is "three million, six hundred forty thousand, eight hundred twenty-three".