2221939 has 4 divisors (see below), whose sum is σ = 2273656. Its totient is φ = 2170224.

The previous prime is 2221931. The next prime is 2221943. The reversal of 2221939 is 9391222.

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 2221939 - 2³ = 2221931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221931) 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 3 ways as a sum of consecutive naturals, for example, 25794 + ... + 25879.

It is an arithmetic number, because the mean of its divisors is an integer number (568414).

2^2221939 is an apocalyptic number.

2221939 is a deficient number, since it is larger than the sum of its proper divisors (51717).

2221939 is an equidigital number, since it uses as much as digits as its factorization.

2221939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51716.

The product of its digits is 1944, while the sum is 28.

The square root of 2221939 is about 1490.6169863516. The cubic root of 2221939 is about 130.4900439159.

It can be divided in two parts, 2221 and 939, that added together give a triangular number (3160 = T₇₉).

The spelling of 2221939 in words is "two million, two hundred twenty-one thousand, nine hundred thirty-nine".