1320129 has 6 divisors (see below), whose sum is σ = 1906866. Its totient is φ = 880080.

The previous prime is 1320127. The next prime is 1320149. The reversal of 1320129 is 9210231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 121104 = 1095^2 + 348^2 .

It is not a de Polignac number, because 1320129 - 2¹ = 1320127 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1320127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73332 + ... + 73349.

It is an arithmetic number, because the mean of its divisors is an integer number (317811).

2^1320129 is an apocalyptic number.

It is an amenable number.

1320129 is a deficient number, since it is larger than the sum of its proper divisors (586737).

1320129 is a wasteful number, since it uses less digits than its factorization.

1320129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146687 (or 146684 counting only the distinct ones).

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

The square root of 1320129 is about 1148.9686679801. The cubic root of 1320129 is about 109.6997043668.

The spelling of 1320129 in words is "one million, three hundred twenty thousand, one hundred twenty-nine".