1312220 has 72 divisors (see below), whose sum is σ = 3485664. Its totient is φ = 411264.

The previous prime is 1312211. The next prime is 1312229. The reversal of 1312220 is 222131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1312211) and next prime (1312229).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12689 + ... + 12791.

It is an arithmetic number, because the mean of its divisors is an integer number (48412).

2^1312220 is an apocalyptic number.

1312220 is a gapful number since it is divisible by the number (10) 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 1312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1742832).

1312220 is an abundant number, since it is smaller than the sum of its proper divisors (2173444).

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

1312220 is a wasteful number, since it uses less digits than its factorization.

1312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1312220 is about 1145.5217152023. The cubic root of 1312220 is about 109.4801921317.

Adding to 1312220 its reverse (222131), we get a palindrome (1534351).

The spelling of 1312220 in words is "one million, three hundred twelve thousand, two hundred twenty".