11806155 has 56 divisors (see below), whose sum is σ = 22034880. Its totient is φ = 6065280.

The previous prime is 11806147. The next prime is 11806189. The reversal of 11806155 is 55160811.

11806155 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11806155 - 2³ = 11806147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 149406 + ... + 149484.

It is an arithmetic number, because the mean of its divisors is an integer number (393480).

Almost surely, 2^11806155 is an apocalyptic number.

11806155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11806155 is a deficient number, since it is larger than the sum of its proper divisors (10228725).

11806155 is an frugal number, since it uses more digits than its factorization.

11806155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 11806155 is about 3436.0085855539. The cubic root of 11806155 is about 227.7033885356.

Adding to 11806155 its reverse (55160811), we get a palindrome (66966966).

The spelling of 11806155 in words is "eleven million, eight hundred six thousand, one hundred fifty-five".