1212784920 has 256 divisors, whose sum is σ = 4218480000. Its totient is φ = 309657600.

The previous prime is 1212784919. The next prime is 1212784921. The reversal of 1212784920 is 294872121.

It is an interprime number because it is at equal distance from previous prime (1212784919) and next prime (1212784921).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212784921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2700856 + ... + 2701304.

Almost surely, 2^1212784920 is an apocalyptic number.

1212784920 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 1212784920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109240000).

1212784920 is an abundant number, since it is smaller than the sum of its proper divisors (3005695080).

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

1212784920 is a wasteful number, since it uses less digits than its factorization.

1212784920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 561 counting only the distinct ones).

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

The square root of 1212784920 is about 34825.0616654156. The cubic root of 1212784920 is about 1066.4191357047.

The spelling of 1212784920 in words is "one billion, two hundred twelve million, seven hundred eighty-four thousand, nine hundred twenty".