2191439 has 4 divisors (see below), whose sum is σ = 2200224. Its totient is φ = 2182656.

The previous prime is 2191433. The next prime is 2191451. The reversal of 2191439 is 9341912.

It is a happy number.

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 2191439 - 2¹² = 2187343 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 1 + 9³ + 1 + 4⁸ + 3¹³ + 9⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191433) 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, 4007 + ... + 4520.

It is an arithmetic number, because the mean of its divisors is an integer number (550056).

2^2191439 is an apocalyptic number.

2191439 is a deficient number, since it is larger than the sum of its proper divisors (8785).

2191439 is an equidigital number, since it uses as much as digits as its factorization.

2191439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8784.

The product of its digits is 1944, while the sum is 29.

The square root of 2191439 is about 1480.3509718982. The cubic root of 2191439 is about 129.8902229079.

The spelling of 2191439 in words is "two million, one hundred ninety-one thousand, four hundred thirty-nine".