1212047928 has 384 divisors, whose sum is σ = 4412620800. Its totient is φ = 304964352.

The previous prime is 1212047909. The next prime is 1212047983. The reversal of 1212047928 is 8297402121.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212047892 and 1212047901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3164425 + ... + 3164807.

It is an arithmetic number, because the mean of its divisors is an integer number (11491200).

Almost surely, 2^1212047928 is an apocalyptic number.

1212047928 is a gapful number since it is divisible by the number (18) 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 1212047928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2206310400).

1212047928 is an abundant number, since it is smaller than the sum of its proper divisors (3200572872).

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

1212047928 is a wasteful number, since it uses less digits than its factorization.

1212047928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 431 counting only the distinct ones).

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

The square root of 1212047928 is about 34814.4787121680. The cubic root of 1212047928 is about 1066.2030760626.

The spelling of 1212047928 in words is "one billion, two hundred twelve million, forty-seven thousand, nine hundred twenty-eight".