1212305320 has 16 divisors (see below), whose sum is σ = 2727687060. Its totient is φ = 484922112.

The previous prime is 1212305293. The next prime is 1212305327. The reversal of 1212305320 is 235032121.

It can be written as a sum of positive squares in 2 ways, for example, as 1185700356 + 26604964 = 34434^2 + 5158^2 .

It is not an unprimeable number, because it can be changed into a prime (1212305327) 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, 15153777 + ... + 15153856.

Almost surely, 2^1212305320 is an apocalyptic number.

1212305320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212305320 is an abundant number, since it is smaller than the sum of its proper divisors (1515381740).

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

1212305320 is a wasteful number, since it uses less digits than its factorization.

1212305320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30307644 (or 30307640 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1212305320 is about 34818.1751388553. The cubic root of 1212305320 is about 1066.2785441228.

Adding to 1212305320 its reverse (235032121), we get a palindrome (1447337441).

The spelling of 1212305320 in words is "one billion, two hundred twelve million, three hundred five thousand, three hundred twenty".