1212632320 has 36 divisors (see below), whose sum is σ = 2904636420. Its totient is φ = 485052416.

The previous prime is 1212632297. The next prime is 1212632327. The reversal of 1212632320 is 232362121.

It can be written as a sum of positive squares in 2 ways, for example, as 759112704 + 453519616 = 27552^2 + 21296^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1212632291 and 1212632300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212632327) 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, 472405 + ... + 474964.

It is an arithmetic number, because the mean of its divisors is an integer number (80684345).

Almost surely, 2^1212632320 is an apocalyptic number.

1212632320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212632320 is an abundant number, since it is smaller than the sum of its proper divisors (1692004100).

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

1212632320 is an frugal number, since it uses more digits than its factorization.

1212632320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947390 (or 947376 counting only the distinct ones).

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

The square root of 1212632320 is about 34822.8706455973. The cubic root of 1212632320 is about 1066.3744060407.

Adding to 1212632320 its reverse (232362121), we get a palindrome (1444994441).

The spelling of 1212632320 in words is "one billion, two hundred twelve million, six hundred thirty-two thousand, three hundred twenty".