1191985208 has 16 divisors (see below), whose sum is σ = 2268331080. Its totient is φ = 587096928.

The previous prime is 1191985199. The next prime is 1191985217. The reversal of 1191985208 is 8025891911.

It is an interprime number because it is at equal distance from previous prime (1191985199) and next prime (1191985217).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111391 + ... + 1112462.

Almost surely, 2^1191985208 is an apocalyptic number.

It is an amenable number.

1191985208 is a deficient number, since it is larger than the sum of its proper divisors (1076345872).

1191985208 is a wasteful number, since it uses less digits than its factorization.

1191985208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223926 (or 2223922 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 44.

The square root of 1191985208 is about 34525.1387832113. The cubic root of 1191985208 is about 1060.2874525976.

The spelling of 1191985208 in words is "one billion, one hundred ninety-one million, nine hundred eighty-five thousand, two hundred eight".