11997755 has 24 divisors (see below), whose sum is σ = 18092256. Its totient is φ = 7476480.

The previous prime is 11997751. The next prime is 11997787. The reversal of 11997755 is 55779911.

It is not a de Polignac number, because 11997755 - 2² = 11997751 is a prime.

It is a super-2 number, since 2×11997755² = 287892250080050, which contains 22 as substring.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (11997751) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2819 + ... + 5651.

It is an arithmetic number, because the mean of its divisors is an integer number (753844).

Almost surely, 2^11997755 is an apocalyptic number.

11997755 is a deficient number, since it is larger than the sum of its proper divisors (6094501).

11997755 is a wasteful number, since it uses less digits than its factorization.

11997755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867 (or 2856 counting only the distinct ones).

The product of its digits is 99225, while the sum is 44.

The square root of 11997755 is about 3463.7775621422. Note that the first 3 decimals coincide. The cubic root of 11997755 is about 228.9285704898.

The spelling of 11997755 in words is "eleven million, nine hundred ninety-seven thousand, seven hundred fifty-five".