1216605450 has 48 divisors (see below), whose sum is σ = 3087364896. Its totient is φ = 316881600.

The previous prime is 1216605433. The next prime is 1216605457. The reversal of 1216605450 is 545066121.

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

It is not an unprimeable number, because it can be changed into a prime (1216605457) 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 23 ways as a sum of consecutive naturals, for example, 87861 + ... + 100760.

It is an arithmetic number, because the mean of its divisors is an integer number (64320102).

Almost surely, 2^1216605450 is an apocalyptic number.

1216605450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216605450 is an abundant number, since it is smaller than the sum of its proper divisors (1870759446).

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

1216605450 is a wasteful number, since it uses less digits than its factorization.

1216605450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188679 (or 188674 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1216605450 is about 34879.8717027457. The cubic root of 1216605450 is about 1067.5377774403.

The spelling of 1216605450 in words is "one billion, two hundred sixteen million, six hundred five thousand, four hundred fifty".