19434839 has 12 divisors (see below), whose sum is σ = 20807856. Its totient is φ = 18117792.

The previous prime is 19434827. The next prime is 19434851. The reversal of 19434839 is 93843491.

It is an interprime number because it is at equal distance from previous prime (19434827) and next prime (19434851).

It is not a de Polignac number, because 19434839 - 2¹² = 19430743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19434796 and 19434805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19434889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42299 + ... + 42755.

It is an arithmetic number, because the mean of its divisors is an integer number (1733988).

Almost surely, 2^19434839 is an apocalyptic number.

19434839 is a deficient number, since it is larger than the sum of its proper divisors (1373017).

19434839 is an equidigital number, since it uses as much as digits as its factorization.

19434839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 523 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 19434839 is about 4408.4962288744. The cubic root of 19434839 is about 268.8604879036.

The spelling of 19434839 in words is "nineteen million, four hundred thirty-four thousand, eight hundred thirty-nine".