1212637380 has 96 divisors (see below), whose sum is σ = 3585254400. Its totient is φ = 305394048.

The previous prime is 1212637369. The next prime is 1212637397. The reversal of 1212637380 is 837362121.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 407779 + ... + 410741.

It is an arithmetic number, because the mean of its divisors is an integer number (37346400).

Almost surely, 2^1212637380 is an apocalyptic number.

1212637380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212637380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792627200).

1212637380 is an abundant number, since it is smaller than the sum of its proper divisors (2372617020).

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

1212637380 is a wasteful number, since it uses less digits than its factorization.

1212637380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353 (or 3351 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1212637380 is about 34822.9432989229. The cubic root of 1212637380 is about 1066.3758892732.

The spelling of 1212637380 in words is "one billion, two hundred twelve million, six hundred thirty-seven thousand, three hundred eighty".