11781690 has 16 divisors (see below), whose sum is σ = 28276128. Its totient is φ = 3141776.

The previous prime is 11781673. The next prime is 11781703. The reversal of 11781690 is 9618711.

It is a super-2 number, since 2×11781690² = 277616438512200, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 196332 + ... + 196391.

It is an arithmetic number, because the mean of its divisors is an integer number (1767258).

Almost surely, 2^11781690 is an apocalyptic number.

11781690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11781690 is an abundant number, since it is smaller than the sum of its proper divisors (16494438).

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

11781690 is a wasteful number, since it uses less digits than its factorization.

11781690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392733.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 11781690 is about 3432.4466492576. The cubic root of 11781690 is about 227.5459956109.

The spelling of 11781690 in words is "eleven million, seven hundred eighty-one thousand, six hundred ninety".