2943891 has 16 divisors (see below), whose sum is σ = 4406400. Its totient is φ = 1942344.

The previous prime is 2943887. The next prime is 2943911. The reversal of 2943891 is 1983492.

It is not a de Polignac number, because 2943891 - 2² = 2943887 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (2943821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2380 + ... + 3398.

It is an arithmetic number, because the mean of its divisors is an integer number (275400).

2^2943891 is an apocalyptic number.

2943891 is a deficient number, since it is larger than the sum of its proper divisors (1462509).

2943891 is a wasteful number, since it uses less digits than its factorization.

2943891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1129 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 2943891 is about 1715.7770834231. Note that the first 3 decimals coincide. The cubic root of 2943891 is about 143.3201460135.

The spelling of 2943891 in words is "two million, nine hundred forty-three thousand, eight hundred ninety-one".