1023564 has 12 divisors (see below), whose sum is σ = 2388344. Its totient is φ = 341184.

The previous prime is 1023557. The next prime is 1023571. The reversal of 1023564 is 4653201.

Added to its reverse (4653201) it gives a triangular number (5676765 = T₃₃₆₉).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1023557) and next prime (1023571).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1023564.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42637 + ... + 42660.

2^1023564 is an apocalyptic number.

It is an amenable number.

1023564 is an abundant number, since it is smaller than the sum of its proper divisors (1364780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1023564 is a wasteful number, since it uses less digits than its factorization.

1023564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85304 (or 85302 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1023564 is about 1011.7133981519. The cubic root of 1023564 is about 100.7793766072.

Adding to 1023564 its reverse (4653201), we get a palindrome (5676765).

The spelling of 1023564 in words is "one million, twenty-three thousand, five hundred sixty-four".