19423639 has 8 divisors (see below), whose sum is σ = 21230208. Its totient is φ = 17690880.

The previous prime is 19423633. The next prime is 19423693. The reversal of 19423639 is 93632491.

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

It is not a de Polignac number, because 19423639 - 2⁷ = 19423511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19423598 and 19423607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19423633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17902 + ... + 18955.

It is an arithmetic number, because the mean of its divisors is an integer number (2653776).

Almost surely, 2^19423639 is an apocalyptic number.

19423639 is a deficient number, since it is larger than the sum of its proper divisors (1806569).

19423639 is a wasteful number, since it uses less digits than its factorization.

19423639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36905.

The product of its digits is 34992, while the sum is 37.

The square root of 19423639 is about 4407.2257713895. The cubic root of 19423639 is about 268.8088312525.

The spelling of 19423639 in words is "nineteen million, four hundred twenty-three thousand, six hundred thirty-nine".