11987655 has 16 divisors (see below), whose sum is σ = 19368960. Its totient is φ = 6330528.

The previous prime is 11987653. The next prime is 11987671. The reversal of 11987655 is 55678911.

It is not a de Polignac number, because 11987655 - 2¹ = 11987653 is a prime.

It is a super-3 number, since 3×11987655³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11987653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2335 + ... + 5424.

It is an arithmetic number, because the mean of its divisors is an integer number (1210560).

Almost surely, 2^11987655 is an apocalyptic number.

11987655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11987655 is a deficient number, since it is larger than the sum of its proper divisors (7381305).

11987655 is a wasteful number, since it uses less digits than its factorization.

11987655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7870.

The product of its digits is 75600, while the sum is 42.

The square root of 11987655 is about 3462.3193093648. The cubic root of 11987655 is about 228.8643132550.

The spelling of 11987655 in words is "eleven million, nine hundred eighty-seven thousand, six hundred fifty-five".