11778540 has 48 divisors (see below), whose sum is σ = 33300960. Its totient is φ = 3110400.

The previous prime is 11778539. The next prime is 11778563. The reversal of 11778540 is 4587711.

It is a congruent number.

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, 5640 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (693770).

Almost surely, 2^11778540 is an apocalyptic number.

11778540 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 11778540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16650480).

11778540 is an abundant number, since it is smaller than the sum of its proper divisors (21522420).

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

11778540 is a wasteful number, since it uses less digits than its factorization.

11778540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 11778540 is about 3431.9877622159. The cubic root of 11778540 is about 227.5257145993.

The spelling of 11778540 in words is "eleven million, seven hundred seventy-eight thousand, five hundred forty".