1289023 has 4 divisors (see below), whose sum is σ = 1296648. Its totient is φ = 1281400.

The previous prime is 1289009. The next prime is 1289027. The reversal of 1289023 is 3209821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1289023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (324162).

2^1289023 is an apocalyptic number.

1289023 is a deficient number, since it is larger than the sum of its proper divisors (7625).

1289023 is an equidigital number, since it uses as much as digits as its factorization.

1289023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1289023 is about 1135.3514874258. The cubic root of 1289023 is about 108.8312344993.

The spelling of 1289023 in words is "one million, two hundred eighty-nine thousand, twenty-three".