12056309 has 4 divisors (see below), whose sum is σ = 12163116. Its totient is φ = 11949504.

The previous prime is 12056287. The next prime is 12056321. The reversal of 12056309 is 90365021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90365021 = 73 ⋅1237877.

It can be written as a sum of positive squares in 2 ways, for example, as 2464900 + 9591409 = 1570^2 + 3097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12056309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12056389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53234 + ... + 53459.

It is an arithmetic number, because the mean of its divisors is an integer number (3040779).

Almost surely, 2^12056309 is an apocalyptic number.

It is an amenable number.

12056309 is a deficient number, since it is larger than the sum of its proper divisors (106807).

12056309 is a wasteful number, since it uses less digits than its factorization.

12056309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106806.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 12056309 is about 3472.2196071101. The cubic root of 12056309 is about 229.3003882633.

The spelling of 12056309 in words is "twelve million, fifty-six thousand, three hundred nine".