1212445320 has 64 divisors (see below), whose sum is σ = 3687189120. Its totient is φ = 318887424.

The previous prime is 1212445307. The next prime is 1212445337. The reversal of 1212445320 is 235442121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60444 + ... + 77963.

It is an arithmetic number, because the mean of its divisors is an integer number (57612330).

Almost surely, 2^1212445320 is an apocalyptic number.

1212445320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212445320 is an abundant number, since it is smaller than the sum of its proper divisors (2474743800).

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

1212445320 is a wasteful number, since it uses less digits than its factorization.

1212445320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138494 (or 138490 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1212445320 is about 34820.1855250658. The cubic root of 1212445320 is about 1066.3195880325.

Adding to 1212445320 its reverse (235442121), we get a palindrome (1447887441).

The spelling of 1212445320 in words is "one billion, two hundred twelve million, four hundred forty-five thousand, three hundred twenty".