1011789440 has 32 divisors (see below), whose sum is σ = 2418810660. Its totient is φ = 404715520.

The previous prime is 1011789437. The next prime is 1011789487. The reversal of 1011789440 is 449871101.

It can be written as a sum of positive squares in 2 ways, for example, as 994014784 + 17774656 = 31528^2 + 4216^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1011789440.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789821 + ... + 791100.

Almost surely, 2^1011789440 is an apocalyptic number.

1011789440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011789440 is an abundant number, since it is smaller than the sum of its proper divisors (1407021220).

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

1011789440 is an equidigital number, since it uses as much as digits as its factorization.

1011789440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580940 (or 1580928 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1011789440 is about 31808.6378205669. The cubic root of 1011789440 is about 1003.9144702620.

The spelling of 1011789440 in words is "one billion, eleven million, seven hundred eighty-nine thousand, four hundred forty".