1191973040 has 40 divisors (see below), whose sum is σ = 2774026320. Its totient is φ = 476326656.

The previous prime is 1191972973. The next prime is 1191973049. The reversal of 1191973040 is 403791911.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1191973049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82691 + ... + 96029.

It is an arithmetic number, because the mean of its divisors is an integer number (69350658).

Almost surely, 2^1191973040 is an apocalyptic number.

1191973040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191973040 is an abundant number, since it is smaller than the sum of its proper divisors (1582053280).

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

1191973040 is a wasteful number, since it uses less digits than its factorization.

1191973040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14469 (or 14463 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 1191973040 is about 34524.9625633396. The cubic root of 1191973040 is about 1060.2838447168.

The spelling of 1191973040 in words is "one billion, one hundred ninety-one million, nine hundred seventy-three thousand, forty".