1312236220 has 24 divisors (see below), whose sum is σ = 2758392000. Its totient is φ = 524380992.

The previous prime is 1312236187. The next prime is 1312236221. The reversal of 1312236220 is 226322131.

It is a junction number, because it is equal to n+sod(n) for n = 1312236191 and 1312236200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312236221) 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, 10795 + ... + 52354.

It is an arithmetic number, because the mean of its divisors is an integer number (114933000).

Almost surely, 2^1312236220 is an apocalyptic number.

1312236220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312236220 is an abundant number, since it is smaller than the sum of its proper divisors (1446155780).

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

1312236220 is a wasteful number, since it uses less digits than its factorization.

1312236220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64197 (or 64195 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1312236220 is about 36224.8011726773. The cubic root of 1312236220 is about 1094.8064321492.

Adding to 1312236220 its reverse (226322131), we get a palindrome (1538558351).

The spelling of 1312236220 in words is "one billion, three hundred twelve million, two hundred thirty-six thousand, two hundred twenty".