2180939 has 4 divisors (see below), whose sum is σ = 2189880. Its totient is φ = 2172000.

The previous prime is 2180923. The next prime is 2180957. The reversal of 2180939 is 9390812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2180939 - 2⁴ = 2180923 is a prime.

It is a Duffinian 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, 4094 + ... + 4595.

It is an arithmetic number, because the mean of its divisors is an integer number (547470).

2^2180939 is an apocalyptic number.

2180939 is a deficient number, since it is larger than the sum of its proper divisors (8941).

2180939 is an equidigital number, since it uses as much as digits as its factorization.

2180939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8940.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2180939 is about 1476.8002573131. The cubic root of 2180939 is about 129.6824398955.

The spelling of 2180939 in words is "two million, one hundred eighty thousand, nine hundred thirty-nine".