1091005420 has 12 divisors (see below), whose sum is σ = 2291111424. Its totient is φ = 436402160.

The previous prime is 1091005393. The next prime is 1091005427. The reversal of 1091005420 is 245001901.

It is a junction number, because it is equal to n+sod(n) for n = 1091005391 and 1091005400.

It is not an unprimeable number, because it can be changed into a prime (1091005427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27275116 + ... + 27275155.

It is an arithmetic number, because the mean of its divisors is an integer number (190925952).

Almost surely, 2^1091005420 is an apocalyptic number.

1091005420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091005420 is an abundant number, since it is smaller than the sum of its proper divisors (1200106004).

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

1091005420 is a wasteful number, since it uses less digits than its factorization.

1091005420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54550280 (or 54550278 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1091005420 is about 33030.3711756317. The cubic root of 1091005420 is about 1029.4587975924.

The spelling of 1091005420 in words is "one billion, ninety-one million, five thousand, four hundred twenty".