1091430720 has 112 divisors (see below), whose sum is σ = 3850355520. Its totient is φ = 291045888.

The previous prime is 1091430679. The next prime is 1091430721. The reversal of 1091430720 is 270341901.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091430721) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 54522 + ... + 71801.

Almost surely, 2^1091430720 is an apocalyptic number.

1091430720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091430720 is an abundant number, since it is smaller than the sum of its proper divisors (2758924800).

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

1091430720 is a wasteful number, since it uses less digits than its factorization.

1091430720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126349 (or 126333 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1091430720 is about 33036.8085625715. The cubic root of 1091430720 is about 1029.5925494323.

The spelling of 1091430720 in words is "one billion, ninety-one million, four hundred thirty thousand, seven hundred twenty".