1091240040 has 64 divisors (see below), whose sum is σ = 3571335360. Its totient is φ = 264542720.

The previous prime is 1091240039. The next prime is 1091240063. The reversal of 1091240040 is 400421901.

It is a junction number, because it is equal to n+sod(n) for n = 1091239989 and 1091240016.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412029 + ... + 414668.

It is an arithmetic number, because the mean of its divisors is an integer number (55802115).

Almost surely, 2^1091240040 is an apocalyptic number.

1091240040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091240040 is an abundant number, since it is smaller than the sum of its proper divisors (2480095320).

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

1091240040 is a wasteful number, since it uses less digits than its factorization.

1091240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826722 (or 826718 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1091240040 is about 33033.9225645396. The cubic root of 1091240040 is about 1029.5325871163.

Adding to 1091240040 its reverse (400421901), we get a palindrome (1491661941).

The spelling of 1091240040 in words is "one billion, ninety-one million, two hundred forty thousand, forty".