1212623380 has 24 divisors (see below), whose sum is σ = 2608620840. Its totient is φ = 473218560.

The previous prime is 1212623369. The next prime is 1212623383. The reversal of 1212623380 is 833262121.

It can be written as a sum of positive squares in 4 ways, for example, as 86081284 + 1126542096 = 9278^2 + 33564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212623383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738585 + ... + 740224.

It is an arithmetic number, because the mean of its divisors is an integer number (108692535).

Almost surely, 2^1212623380 is an apocalyptic number.

1212623380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212623380 is an abundant number, since it is smaller than the sum of its proper divisors (1395997460).

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

1212623380 is a wasteful number, since it uses less digits than its factorization.

1212623380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478859 (or 1478857 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1212623380 is about 34822.7422814459. The cubic root of 1212623380 is about 1066.3717854578.

The spelling of 1212623380 in words is "one billion, two hundred twelve million, six hundred twenty-three thousand, three hundred eighty".