1023643 has 2 divisors, whose sum is σ = 1023644. Its totient is φ = 1023642.

The previous prime is 1023601. The next prime is 1023653. The reversal of 1023643 is 3463201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1023643 - 2¹³ = 1015451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1023643.

It is not a weakly prime, because it can be changed into another prime (1023653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511821 + 511822.

It is an arithmetic number, because the mean of its divisors is an integer number (511822).

2^1023643 is an apocalyptic number.

1023643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023643 is an equidigital number, since it uses as much as digits as its factorization.

1023643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1023643 is about 1011.7524400761. The cubic root of 1023643 is about 100.7819693016.

Adding to 1023643 its reverse (3463201), we get a palindrome (4486844).

It can be divided in two parts, 10 and 23643, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 1023643 in words is "one million, twenty-three thousand, six hundred forty-three".