1191339648 has 96 divisors (see below), whose sum is σ = 3577335840. Its totient is φ = 379838976.

The previous prime is 1191339631. The next prime is 1191339659. The reversal of 1191339648 is 8469331911.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4015 + ... + 48977.

It is an arithmetic number, because the mean of its divisors is an integer number (37263915).

Almost surely, 2^1191339648 is an apocalyptic number.

1191339648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1191339648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1788667920).

1191339648 is an abundant number, since it is smaller than the sum of its proper divisors (2385996192).

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

1191339648 is a wasteful number, since it uses less digits than its factorization.

1191339648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45006 (or 44991 counting only the distinct ones).

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

The square root of 1191339648 is about 34515.7883873453. The cubic root of 1191339648 is about 1060.0960064935.

The spelling of 1191339648 in words is "one billion, one hundred ninety-one million, three hundred thirty-nine thousand, six hundred forty-eight".