11778745 has 12 divisors (see below), whose sum is σ = 15537060. Its totient is φ = 8565920.

The previous prime is 11778733. The next prime is 11778749. The reversal of 11778745 is 54787711.

It can be written as a sum of positive squares in 2 ways, for example, as 4276624 + 7502121 = 2068^2 + 2739^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11778745 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11778698 and 11778707.

It is not an unprimeable number, because it can be changed into a prime (11778749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9130 + ... + 10339.

It is an arithmetic number, because the mean of its divisors is an integer number (1294755).

Almost surely, 2^11778745 is an apocalyptic number.

It is an amenable number.

11778745 is a deficient number, since it is larger than the sum of its proper divisors (3758315).

11778745 is a wasteful number, since it uses less digits than its factorization.

11778745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19496 (or 19485 counting only the distinct ones).

The product of its digits is 54880, while the sum is 40.

The square root of 11778745 is about 3432.0176281599. The cubic root of 11778745 is about 227.5270345846.

The spelling of 11778745 in words is "eleven million, seven hundred seventy-eight thousand, seven hundred forty-five".