1216699434 has 64 divisors (see below), whose sum is σ = 2769984000. Its totient is φ = 395691264.

The previous prime is 1216699427. The next prime is 1216699457. The reversal of 1216699434 is 4349966121.

1216699434 is a `hidden beast` number, since 121 + 6 + 6 + 99 + 434 = 666.

It is a super-3 number, since 3×1216699434³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1216699434.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1159342 + ... + 1160390.

It is an arithmetic number, because the mean of its divisors is an integer number (43281000).

Almost surely, 2^1216699434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216699434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1384992000).

1216699434 is an abundant number, since it is smaller than the sum of its proper divisors (1553284566).

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

1216699434 is a wasteful number, since it uses less digits than its factorization.

1216699434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564 (or 1558 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 1216699434 is about 34881.2189293895. The cubic root of 1216699434 is about 1067.5652661897.

The spelling of 1216699434 in words is "one billion, two hundred sixteen million, six hundred ninety-nine thousand, four hundred thirty-four".