11947155 has 32 divisors (see below), whose sum is σ = 21212928. Its totient is φ = 5692800.

The previous prime is 11947153. The next prime is 11947193. The reversal of 11947155 is 55174911.

11947155 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 11947155 - 2¹ = 11947153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (11947153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9472 + ... + 10658.

It is an arithmetic number, because the mean of its divisors is an integer number (662904).

Almost surely, 2^11947155 is an apocalyptic number.

11947155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11947155 is a deficient number, since it is larger than the sum of its proper divisors (9265773).

11947155 is a wasteful number, since it uses less digits than its factorization.

11947155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267.

The product of its digits is 6300, while the sum is 33.

The square root of 11947155 is about 3456.4656804314. The cubic root of 11947155 is about 228.6062849558.

It can be divided in two parts, 119 and 47155, that added together give a palindrome (47274).

The spelling of 11947155 in words is "eleven million, nine hundred forty-seven thousand, one hundred fifty-five".