1290321 has 12 divisors (see below), whose sum is σ = 1873872. Its totient is φ = 855576.

The previous prime is 1290319. The next prime is 1290329. The reversal of 1290321 is 1230921.

It is a happy number.

It is not a de Polignac number, because 1290321 - 2¹ = 1290319 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1290294 and 1290303.

It is not an unprimeable number, because it can be changed into a prime (1290329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2530 + ... + 2996.

It is an arithmetic number, because the mean of its divisors is an integer number (156156).

2^1290321 is an apocalyptic number.

It is an amenable number.

1290321 is a deficient number, since it is larger than the sum of its proper divisors (583551).

1290321 is a wasteful number, since it uses less digits than its factorization.

1290321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1290321 is about 1135.9229727407. The cubic root of 1290321 is about 108.8677519634.

The spelling of 1290321 in words is "one million, two hundred ninety thousand, three hundred twenty-one".