1211242928 has 120 divisors (see below), whose sum is σ = 2974785792. Its totient is φ = 467039232.

The previous prime is 1211242927. The next prime is 1211242993. The reversal of 1211242928 is 8292421121.

It is a junction number, because it is equal to n+sod(n) for n = 1211242894 and 1211242903.

It is not an unprimeable number, because it can be changed into a prime (1211242927) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 743651 + ... + 745277.

Almost surely, 2^1211242928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211242928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1487392896).

1211242928 is an abundant number, since it is smaller than the sum of its proper divisors (1763542864).

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

1211242928 is a wasteful number, since it uses less digits than its factorization.

1211242928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699 (or 1676 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 1211242928 is about 34802.9155100546. The cubic root of 1211242928 is about 1065.9669788086.

The spelling of 1211242928 in words is "one billion, two hundred eleven million, two hundred forty-two thousand, nine hundred twenty-eight".