1309012 has 12 divisors (see below), whose sum is σ = 2317140. Its totient is φ = 646976.

The previous prime is 1308977. The next prime is 1309013. The reversal of 1309012 is 2109031.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 662596 = 804^2 + 814^2 .

It is a super-2 number, since 2×1309012² = 3427024832288, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309013) 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, 1483 + ... + 2194.

It is an arithmetic number, because the mean of its divisors is an integer number (193095).

2^1309012 is an apocalyptic number.

It is an amenable number.

1309012 is a deficient number, since it is larger than the sum of its proper divisors (1008128).

1309012 is a wasteful number, since it uses less digits than its factorization.

1309012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770 (or 3768 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1309012 is about 1144.1206230114. The cubic root of 1309012 is about 109.3909034834.

It can be divided in two parts, 13090 and 12, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 1309012 in words is "one million, three hundred nine thousand, twelve".