1091425440 has 384 divisors, whose sum is σ = 4250050560. Its totient is φ = 229920768.

The previous prime is 1091425403. The next prime is 1091425451. The reversal of 1091425440 is 445241901.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1091425398 and 1091425407.

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, 2240877 + ... + 2241363.

It is an arithmetic number, because the mean of its divisors is an integer number (11067840).

Almost surely, 2^1091425440 is an apocalyptic number.

1091425440 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 1091425440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2125025280).

1091425440 is an abundant number, since it is smaller than the sum of its proper divisors (3158625120).

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

1091425440 is a wasteful number, since it uses less digits than its factorization.

1091425440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1091425440 is about 33036.7286516083. The cubic root of 1091425440 is about 1029.5908891476.

The spelling of 1091425440 in words is "one billion, ninety-one million, four hundred twenty-five thousand, four hundred forty".