1216884536 has 32 divisors (see below), whose sum is σ = 2628157440. Its totient is φ = 517412448.

The previous prime is 1216884511. The next prime is 1216884541. The reversal of 1216884536 is 6354886121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78440 + ... + 92663.

It is an arithmetic number, because the mean of its divisors is an integer number (82129920).

Almost surely, 2^1216884536 is an apocalyptic number.

It is an amenable number.

1216884536 is an abundant number, since it is smaller than the sum of its proper divisors (1411272904).

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

1216884536 is a wasteful number, since it uses less digits than its factorization.

1216884536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171243 (or 171239 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 1216884536 is about 34883.8721474552. The cubic root of 1216884536 is about 1067.6194012922.

The spelling of 1216884536 in words is "one billion, two hundred sixteen million, eight hundred eighty-four thousand, five hundred thirty-six".