1216003650 has 24 divisors (see below), whose sum is σ = 3015689424. Its totient is φ = 324267600.

The previous prime is 1216003639. The next prime is 1216003661. The reversal of 1216003650 is 563006121.

It is an interprime number because it is at equal distance from previous prime (1216003639) and next prime (1216003661).

It is a self number, because there is not a number n which added to its sum of digits gives 1216003650.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4053196 + ... + 4053495.

It is an arithmetic number, because the mean of its divisors is an integer number (125653726).

Almost surely, 2^1216003650 is an apocalyptic number.

1216003650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216003650 is an abundant number, since it is smaller than the sum of its proper divisors (1799685774).

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

1216003650 is a wasteful number, since it uses less digits than its factorization.

1216003650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106706 (or 8106701 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1216003650 is about 34871.2438837504. The cubic root of 1216003650 is about 1067.3617274335.

Adding to 1216003650 its reverse (563006121), we get a palindrome (1779009771).

It can be divided in two parts, 121600 and 3650, that added together give a triangular number (125250 = T₅₀₀).

The spelling of 1216003650 in words is "one billion, two hundred sixteen million, three thousand, six hundred fifty".