1309072 has 10 divisors (see below), whose sum is σ = 2536358. Its totient is φ = 654528.

The previous prime is 1309067. The next prime is 1309073. The reversal of 1309072 is 2709031.

It can be written as a sum of positive squares in only one way, i.e., 767376 + 541696 = 876^2 + 736^2 .

It is not an unprimeable number, because it can be changed into a prime (1309073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40893 + ... + 40924.

2^1309072 is an apocalyptic number.

It is an amenable number.

1309072 is a deficient number, since it is larger than the sum of its proper divisors (1227286).

1309072 is an equidigital number, since it uses as much as digits as its factorization.

1309072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81825 (or 81819 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 1309072 is about 1144.1468437224. The cubic root of 1309072 is about 109.3925748085.

The spelling of 1309072 in words is "one million, three hundred nine thousand, seventy-two".