2180949 has 4 divisors (see below), whose sum is σ = 2907936. Its totient is φ = 1453964.

The previous prime is 2180923. The next prime is 2180957. The reversal of 2180949 is 9490812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2180949 - 2⁸ = 2180693 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363489 + ... + 363494.

It is an arithmetic number, because the mean of its divisors is an integer number (726984).

2^2180949 is an apocalyptic number.

It is an amenable number.

2180949 is a deficient number, since it is larger than the sum of its proper divisors (726987).

2180949 is an equidigital number, since it uses as much as digits as its factorization.

2180949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726986.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2180949 is about 1476.8036430074. The cubic root of 2180949 is about 129.6826381010.

Subtracting from 2180949 its sum of digits (33), we obtain a triangular number (2180916 = T₂₀₈₈).

The spelling of 2180949 in words is "two million, one hundred eighty thousand, nine hundred forty-nine".