1289397 has 8 divisors (see below), whose sum is σ = 1809760. Its totient is φ = 814320.

The previous prime is 1289381. The next prime is 1289401. The reversal of 1289397 is 7939821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1289397 - 2⁴ = 1289381 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 (1289597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11254 + ... + 11367.

It is an arithmetic number, because the mean of its divisors is an integer number (226220).

2^1289397 is an apocalyptic number.

It is an amenable number.

1289397 is a deficient number, since it is larger than the sum of its proper divisors (520363).

1289397 is a wasteful number, since it uses less digits than its factorization.

1289397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22643.

The product of its digits is 27216, while the sum is 39.

The square root of 1289397 is about 1135.5161821832. The cubic root of 1289397 is about 108.8417589937.

The spelling of 1289397 in words is "one million, two hundred eighty-nine thousand, three hundred ninety-seven".