1197191808 has 48 divisors (see below), whose sum is σ = 3445047450. Its totient is φ = 399063552.

The previous prime is 1197191797. The next prime is 1197191813. The reversal of 1197191808 is 8081917911.

It can be written as a sum of positive squares in only one way, i.e., 1092170304 + 105021504 = 33048^2 + 10248^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 518463 + ... + 520766.

Almost surely, 2^1197191808 is an apocalyptic number.

1197191808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1197191808 is an abundant number, since it is smaller than the sum of its proper divisors (2247855642).

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

1197191808 is a wasteful number, since it uses less digits than its factorization.

1197191808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039249 (or 1039234 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 45.

The square root of 1197191808 is about 34600.4596501260. The cubic root of 1197191808 is about 1061.8289913717.

The spelling of 1197191808 in words is "one billion, one hundred ninety-seven million, one hundred ninety-one thousand, eight hundred eight".