1309212 has 36 divisors (see below), whose sum is σ = 3393936. Its totient is φ = 425280.

The previous prime is 1309211. The next prime is 1309219. The reversal of 1309212 is 2129031.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1033 + ... + 1919.

It is an arithmetic number, because the mean of its divisors is an integer number (94276).

2^1309212 is an apocalyptic number.

1309212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696968).

1309212 is an abundant number, since it is smaller than the sum of its proper divisors (2084724).

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

1309212 is a wasteful number, since it uses less digits than its factorization.

1309212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 933 counting only the distinct ones).

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

The square root of 1309212 is about 1144.2080230448. The cubic root of 1309212 is about 109.3964743685.

It can be divided in two parts, 1309 and 212, that added together give a square (1521 = 39²).

The spelling of 1309212 in words is "one million, three hundred nine thousand, two hundred twelve".