1289123 has 4 divisors (see below), whose sum is σ = 1406328. Its totient is φ = 1171920.

The previous prime is 1289111. The next prime is 1289129. The reversal of 1289123 is 3219821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3219821 = 11 ⋅292711.

It is a cyclic number.

It is not a de Polignac number, because 1289123 - 2¹⁰ = 1288099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1289092 and 1289101.

It is not an unprimeable number, because it can be changed into a prime (1289129) 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, 58586 + ... + 58607.

It is an arithmetic number, because the mean of its divisors is an integer number (351582).

2^1289123 is an apocalyptic number.

1289123 is a deficient number, since it is larger than the sum of its proper divisors (117205).

1289123 is a wasteful number, since it uses less digits than its factorization.

1289123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117204.

The product of its digits is 864, while the sum is 26.

The square root of 1289123 is about 1135.3955257971. The cubic root of 1289123 is about 108.8340487346.

The spelling of 1289123 in words is "one million, two hundred eighty-nine thousand, one hundred twenty-three".