11781406 has 32 divisors (see below), whose sum is σ = 22901760. Its totient is φ = 4414176.

The previous prime is 11781389. The next prime is 11781421. The reversal of 11781406 is 60418711.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1755 + ... + 5161.

It is an arithmetic number, because the mean of its divisors is an integer number (715680).

Almost surely, 2^11781406 is an apocalyptic number.

11781406 is a deficient number, since it is larger than the sum of its proper divisors (11120354).

11781406 is a wasteful number, since it uses less digits than its factorization.

11781406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 11781406 is about 3432.4052791009. The cubic root of 11781406 is about 227.5441672489.

The spelling of 11781406 in words is "eleven million, seven hundred eighty-one thousand, four hundred six".