1163209986 has 12 divisors (see below), whose sum is σ = 2520288342. Its totient is φ = 387736656.

The previous prime is 1163209979. The next prime is 1163209987. The reversal of 1163209986 is 6899023611.

It is a happy number.

1163209986 is a `hidden beast` number, since 1 + 1 + 632 + 0 + 9 + 9 + 8 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 931409361 + 231800625 = 30519^2 + 15225^2 .

It is not an unprimeable number, because it can be changed into a prime (1163209987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32311371 + ... + 32311406.

Almost surely, 2^1163209986 is an apocalyptic number.

1163209986 is an abundant number, since it is smaller than the sum of its proper divisors (1357078356).

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

1163209986 is a wasteful number, since it uses less digits than its factorization.

1163209986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64622785 (or 64622782 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1163209986 is about 34105.8643930923. The cubic root of 1163209986 is about 1051.6858740345.

The spelling of 1163209986 in words is "one billion, one hundred sixty-three million, two hundred nine thousand, nine hundred eighty-six".