2155947 has 8 divisors (see below), whose sum is σ = 2973840. Its totient is φ = 1387680.

The previous prime is 2155931. The next prime is 2155961. The reversal of 2155947 is 7495512.

2155947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155947 - 2⁴ = 2155931 is a prime.

It is a super-3 number, since 3×2155947³ = 30063220046233389369, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2150947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12304 + ... + 12477.

It is an arithmetic number, because the mean of its divisors is an integer number (371730).

2^2155947 is an apocalyptic number.

2155947 is a deficient number, since it is larger than the sum of its proper divisors (817893).

2155947 is a wasteful number, since it uses less digits than its factorization.

2155947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24813.

The product of its digits is 12600, while the sum is 33.

The square root of 2155947 is about 1468.3143396426. The cubic root of 2155947 is about 129.1851796334.

The spelling of 2155947 in words is "two million, one hundred fifty-five thousand, nine hundred forty-seven".