309012 has 24 divisors (see below), whose sum is σ = 786912. Its totient is φ = 93600.

The previous prime is 309011. The next prime is 309013. The reversal of 309012 is 210903.

It is an interprime number because it is at equal distance from previous prime (309011) and next prime (309013).

It is a super-2 number, since 2×309012² = 190976832288, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 308982 and 309000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039 + ... + 1302.

It is an arithmetic number, because the mean of its divisors is an integer number (32788).

2³⁰⁹⁰¹² is an apocalyptic number.

It is an amenable number.

309012 is an abundant number, since it is smaller than the sum of its proper divisors (477900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309012 is a wasteful number, since it uses less digits than its factorization.

309012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359 (or 2357 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 309012 is about 555.8884780241. Note that the first 3 decimals coincide. The cubic root of 309012 is about 67.6070181666.

Adding to 309012 its reverse (210903), we get a palindrome (519915).

It can be divided in two parts, 30901 and 2, that added together give a palindrome (30903).

The spelling of 309012 in words is "three hundred nine thousand, twelve".