22191439 has 4 divisors (see below), whose sum is σ = 22212424. Its totient is φ = 22170456.

The previous prime is 22191427. The next prime is 22191451. The reversal of 22191439 is 93419122.

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

It is an interprime number because it is at equal distance from previous prime (22191427) and next prime (22191451).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22191439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22191439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22191469) 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, 8817 + ... + 11050.

It is an arithmetic number, because the mean of its divisors is an integer number (5553106).

Almost surely, 2^22191439 is an apocalyptic number.

22191439 is a deficient number, since it is larger than the sum of its proper divisors (20985).

22191439 is a wasteful number, since it uses less digits than its factorization.

22191439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20984.

The product of its digits is 3888, while the sum is 31.

The square root of 22191439 is about 4710.7790226246. The cubic root of 22191439 is about 281.0143439021.

The spelling of 22191439 in words is "twenty-two million, one hundred ninety-one thousand, four hundred thirty-nine".