1320291 has 24 divisors (see below), whose sum is σ = 2296320. Its totient is φ = 714096.

The previous prime is 1320287. The next prime is 1320301. The reversal of 1320291 is 1920231.

It is a happy number.

It is not a de Polignac number, because 1320291 - 2² = 1320287 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1320211) 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, 646 + ... + 1748.

It is an arithmetic number, because the mean of its divisors is an integer number (95680).

2^1320291 is an apocalyptic number.

1320291 is a deficient number, since it is larger than the sum of its proper divisors (976029).

1320291 is a wasteful number, since it uses less digits than its factorization.

1320291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1132 counting only the distinct ones).

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

The square root of 1320291 is about 1149.0391638234. The cubic root of 1320291 is about 109.7041914599.

The spelling of 1320291 in words is "one million, three hundred twenty thousand, two hundred ninety-one".