1289421 has 24 divisors (see below), whose sum is σ = 2160704. Its totient is φ = 725760.

The previous prime is 1289411. The next prime is 1289423. The reversal of 1289421 is 1249821.

It is not a de Polignac number, because 1289421 - 2¹¹ = 1287373 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6006 + ... + 6216.

2^1289421 is an apocalyptic number.

It is an amenable number.

1289421 is a deficient number, since it is larger than the sum of its proper divisors (871283).

1289421 is a wasteful number, since it uses less digits than its factorization.

1289421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 318 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1289421 is about 1135.5267500152. The cubic root of 1289421 is about 108.8424342928.

The spelling of 1289421 in words is "one million, two hundred eighty-nine thousand, four hundred twenty-one".