1212193840 has 320 divisors, whose sum is σ = 3671764992. Its totient is φ = 364953600.

The previous prime is 1212193831. The next prime is 1212193859. The reversal of 1212193840 is 483912121.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4472905 + ... + 4473175.

Almost surely, 2^1212193840 is an apocalyptic number.

1212193840 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 1212193840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1835882496).

1212193840 is an abundant number, since it is smaller than the sum of its proper divisors (2459571152).

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

1212193840 is a wasteful number, since it uses less digits than its factorization.

1212193840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1212193840 is about 34816.5742140148. The cubic root of 1212193840 is about 1066.2458591839.

The spelling of 1212193840 in words is "one billion, two hundred twelve million, one hundred ninety-three thousand, eight hundred forty".