1209216844 has 48 divisors (see below), whose sum is σ = 2354075136. Its totient is φ = 538904000.

The previous prime is 1209216823. The next prime is 1209216863. The reversal of 1209216844 is 4486129021.

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 15 ways as a sum of consecutive naturals, for example, 474237 + ... + 476779.

It is an arithmetic number, because the mean of its divisors is an integer number (49043232).

Almost surely, 2^1209216844 is an apocalyptic number.

It is an amenable number.

1209216844 is a deficient number, since it is larger than the sum of its proper divisors (1144858292).

1209216844 is a wasteful number, since it uses less digits than its factorization.

1209216844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766 (or 2764 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1209216844 is about 34773.7953637506. The cubic root of 1209216844 is about 1065.3722883102.

It can be divided in two parts, 120921 and 6844, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 1209216844 in words is "one billion, two hundred nine million, two hundred sixteen thousand, eight hundred forty-four".