1321299 has 16 divisors (see below), whose sum is σ = 2237440. Its totient is φ = 754920.

The previous prime is 1321289. The next prime is 1321301. The reversal of 1321299 is 9921231.

It is not a de Polignac number, because 1321299 - 2⁴ = 1321283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3307 + ... + 3684.

It is an arithmetic number, because the mean of its divisors is an integer number (139840).

2^1321299 is an apocalyptic number.

1321299 is a deficient number, since it is larger than the sum of its proper divisors (916141).

1321299 is an equidigital number, since it uses as much as digits as its factorization.

1321299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007 (or 7001 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1321299 is about 1149.4777074828. The cubic root of 1321299 is about 109.7321029065.

It can be divided in two parts, 132 and 1299, that added together give a triangular number (1431 = T₅₃).

The spelling of 1321299 in words is "one million, three hundred twenty-one thousand, two hundred ninety-nine".