2156949 has 20 divisors (see below), whose sum is σ = 3329920. Its totient is φ = 1389960.

The previous prime is 2156939. The next prime is 2156993. The reversal of 2156949 is 9496512.

It is not a de Polignac number, because 2156949 - 2⁹ = 2156437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156939) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2082 + ... + 2940.

It is an arithmetic number, because the mean of its divisors is an integer number (166496).

2^2156949 is an apocalyptic number.

It is an amenable number.

2156949 is a deficient number, since it is larger than the sum of its proper divisors (1172971).

2156949 is an equidigital number, since it uses as much as digits as its factorization.

2156949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 893 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 2156949 is about 1468.6555075987. The cubic root of 2156949 is about 129.2051899432.

The spelling of 2156949 in words is "two million, one hundred fifty-six thousand, nine hundred forty-nine".