1216440750 has 128 divisors (see below), whose sum is σ = 3487131648. Its totient is φ = 276672000.

The previous prime is 1216440739. The next prime is 1216440751. The reversal of 1216440750 is 570446121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216440751) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 1380310 + ... + 1381190.

It is an arithmetic number, because the mean of its divisors is an integer number (27243216).

Almost surely, 2^1216440750 is an apocalyptic number.

1216440750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216440750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1743565824).

1216440750 is an abundant number, since it is smaller than the sum of its proper divisors (2270690898).

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

1216440750 is a wasteful number, since it uses less digits than its factorization.

1216440750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1216440750 is about 34877.5106623165. The cubic root of 1216440750 is about 1067.4896020282.

Adding to 1216440750 its reverse (570446121), we get a palindrome (1786886871).

The spelling of 1216440750 in words is "one billion, two hundred sixteen million, four hundred forty thousand, seven hundred fifty".