2155949 has 8 divisors (see below), whose sum is σ = 2283840. Its totient is φ = 2029536.

The previous prime is 2155931. The next prime is 2155961. The reversal of 2155949 is 9495512.

2155949 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155949 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 5⁷ + 5⁹ + 9² + 4⁸ + 9⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155999) 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, 4184 + ... + 4670.

It is an arithmetic number, because the mean of its divisors is an integer number (285480).

2^2155949 is an apocalyptic number.

It is an amenable number.

2155949 is a deficient number, since it is larger than the sum of its proper divisors (127891).

2155949 is a wasteful number, since it uses less digits than its factorization.

2155949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739.

The product of its digits is 16200, while the sum is 35.

The square root of 2155949 is about 1468.3150206955. The cubic root of 2155949 is about 129.1852195804.

The spelling of 2155949 in words is "two million, one hundred fifty-five thousand, nine hundred forty-nine".