1212974820 has 288 divisors, whose sum is σ = 4239406080. Its totient is φ = 278691840.

The previous prime is 1212974783. The next prime is 1212974843. The reversal of 1212974820 is 284792121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1802004 + ... + 1802676.

It is an arithmetic number, because the mean of its divisors is an integer number (14720160).

Almost surely, 2^1212974820 is an apocalyptic number.

1212974820 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 1212974820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119703040).

1212974820 is an abundant number, since it is smaller than the sum of its proper divisors (3026431260).

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

1212974820 is a wasteful number, since it uses less digits than its factorization.

1212974820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1212974820 is about 34827.7880434575. The cubic root of 1212974820 is about 1066.4747933957.

The spelling of 1212974820 in words is "one billion, two hundred twelve million, nine hundred seventy-four thousand, eight hundred twenty".