1191390772 has 24 divisors (see below), whose sum is σ = 2449433952. Its totient is φ = 499884000.

The previous prime is 1191390769. The next prime is 1191390773. The reversal of 1191390772 is 2770931911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191390773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040854 + ... + 1041997.

It is an arithmetic number, because the mean of its divisors is an integer number (102059748).

Almost surely, 2^1191390772 is an apocalyptic number.

It is an amenable number.

1191390772 is an abundant number, since it is smaller than the sum of its proper divisors (1258043180).

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

1191390772 is a wasteful number, since it uses less digits than its factorization.

1191390772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082879 (or 2082877 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 40.

The square root of 1191390772 is about 34516.5289680176. The cubic root of 1191390772 is about 1060.1111702556. Note that the first 4 decimals are identical.

The spelling of 1191390772 in words is "one billion, one hundred ninety-one million, three hundred ninety thousand, seven hundred seventy-two".