1091167440 has 320 divisors, whose sum is σ = 4009243392. Its totient is φ = 242483200.

The previous prime is 1091167411. The next prime is 1091167471. The reversal of 1091167440 is 447611901.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1839784 + ... + 1840376.

Almost surely, 2^1091167440 is an apocalyptic number.

1091167440 is a gapful number since it is divisible by the number (10) 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 1091167440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2004621696).

1091167440 is an abundant number, since it is smaller than the sum of its proper divisors (2918075952).

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

1091167440 is a wasteful number, since it uses less digits than its factorization.

1091167440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1091167440 is about 33032.8236758531. The cubic root of 1091167440 is about 1029.5097550718.

The spelling of 1091167440 in words is "one billion, ninety-one million, one hundred sixty-seven thousand, four hundred forty".