1289445 has 32 divisors (see below), whose sum is σ = 2211840. Its totient is φ = 640320.

The previous prime is 1289429. The next prime is 1289447. The reversal of 1289445 is 5449821.

It is not a de Polignac number, because 1289445 - 2⁴ = 1289429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21826 + ... + 21884.

It is an arithmetic number, because the mean of its divisors is an integer number (69120).

2^1289445 is an apocalyptic number.

1289445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1289445 is a deficient number, since it is larger than the sum of its proper divisors (922395).

1289445 is a wasteful number, since it uses less digits than its factorization.

1289445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145.

The product of its digits is 11520, while the sum is 33.

The square root of 1289445 is about 1135.5373177487. The cubic root of 1289445 is about 108.8431095836.

The spelling of 1289445 in words is "one million, two hundred eighty-nine thousand, four hundred forty-five".