1023689 has 4 divisors (see below), whose sum is σ = 1083924. Its totient is φ = 963456.

The previous prime is 1023653. The next prime is 1023697. The reversal of 1023689 is 9863201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 284089 + 739600 = 533^2 + 860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30092 + ... + 30125.

It is an arithmetic number, because the mean of its divisors is an integer number (270981).

2^1023689 is an apocalyptic number.

It is an amenable number.

1023689 is a deficient number, since it is larger than the sum of its proper divisors (60235).

1023689 is an equidigital number, since it uses as much as digits as its factorization.

1023689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60234.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1023689 is about 1011.7751726545. The cubic root of 1023689 is about 100.7834789103.

It can be divided in two parts, 102 and 3689, that multiplied together give a triangular number (376278 = T₈₆₇).

The spelling of 1023689 in words is "one million, twenty-three thousand, six hundred eighty-nine".