1216893266 has 8 divisors (see below), whose sum is σ = 1921410480. Its totient is φ = 576423108.

The previous prime is 1216893263. The next prime is 1216893317. The reversal of 1216893266 is 6623986121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1216893266³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1216893263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16011716 + ... + 16011791.

It is an arithmetic number, because the mean of its divisors is an integer number (240176310).

Almost surely, 2^1216893266 is an apocalyptic number.

1216893266 is a deficient number, since it is larger than the sum of its proper divisors (704517214).

1216893266 is a wasteful number, since it uses less digits than its factorization.

1216893266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32023528.

The product of its digits is 186624, while the sum is 44.

The square root of 1216893266 is about 34883.9972766883. The cubic root of 1216893266 is about 1067.6219543405.

The spelling of 1216893266 in words is "one billion, two hundred sixteen million, eight hundred ninety-three thousand, two hundred sixty-six".