2191939 has 8 divisors (see below), whose sum is σ = 2260800. Its totient is φ = 2124096.

The previous prime is 2191883. The next prime is 2191949. The reversal of 2191939 is 9391912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2191939 - 2⁷ = 2191811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2191949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6847 + ... + 7159.

It is an arithmetic number, because the mean of its divisors is an integer number (282600).

2^2191939 is an apocalyptic number.

2191939 is a deficient number, since it is larger than the sum of its proper divisors (68861).

2191939 is a wasteful number, since it uses less digits than its factorization.

2191939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509.

The product of its digits is 4374, while the sum is 34.

The square root of 2191939 is about 1480.5198411369. The cubic root of 2191939 is about 129.9001007663.

The spelling of 2191939 in words is "two million, one hundred ninety-one thousand, nine hundred thirty-nine".